Business and Finance Homework

Need finance homework help? Ask an Expert

Connect one-on-one with {0} who will answer your question

Customer Question

I see that you have...

I see that you have already answered these problems for someone else and I would like to see if you could answer these questions for me.

Coladarci text

Chapter 14: Exercises 2, 4, 8, 9, 12, 16

Chapter 15: Exercises 2, 12

Chapter 16: Exercises 1, 7, 9 2.

Chapter 14

2. A graduate student wishes to compare the high school grade-point averages (GPAs) of males and females. He identiﬁes 50 brother/sister pairs, obtains the GPA for each individual, and proceeds to test H0: mmales mfemales ¼ 0. Are the methods discussed in this chapter appropriate for such a test? (Explain.)

4. Assume H0: m1 m2 ¼ 0 is true. What are the three deﬁning characteristics of the sampling distribution of differences between means?

8. Does familiarity with an assessment increase test scores? You hypothesize that it does. You identify 11 ﬁfth-grade students to take a writing assessment that they had not experienced before. Six of these students are selected at random and, before taking the assessment, are provided with a general overview of its rationale, length, question format, and so on. The remaining ﬁve students are not given this overview. The following are the scores (number of points) for students in each group: overview provided : 20; 18; 14; 22; 16; 16 no overview provided : 11; 15; 16; 13; 9 (a) Set up H0 and H1 (b) Perform the test (a ¼ :01). (c) Draw your ﬁnal conclusions.

9. An educational psychologist is interested in knowing whether the experience of attending preschool is related to subsequent sociability. She identiﬁes two groups of ﬁrst graders: those who had attended preschool and those who had not. Then each child is assigned a sociability score on the basis of observations made in the classroom and on the playground. The following sociability results are obtained: Attended Preschool Did Not Attend Preschool n1 ¼ 12; SX1 ¼ 204; SS1 ¼ 192 n2 ¼ 16; SX2 ¼ 248; SS2 ¼ 154 (a) Set up the appropriate statistical hypotheses. (b) Perform the test (a ¼ :05). (c) Draw ﬁnal conclusions.

12. Parametric statistical tests are tests that are based on one or more assumptions about the nature of the populations from which the samples are selected. What assumptions are required in the t test of H0: m1 m2 ¼ 0?

16. The director of Academic Support Services wants to test the efficacy of a possible intervention for undergraduate students who are placed on academic probation. She randomly assigns 28 such students to two groups. During the ﬁrst week of the semester, students in Group 1 receive daily instruction on speciﬁc strategies for learning and studying. Group 2 students spend the same time engaged in general discussion about the importance of doing well in college and the support services that are available on campus. At the end of the semester, the director determines the mean GPA for each group: Group 1 (Strategy Instruction) Group 2 (General Discussion) n1 ¼ 14; X1 ¼ 2:83; s1 ¼:41 n2 ¼ 14; X2 ¼ 2:26; s2 ¼ :39 (a) Set up the appropriate statistical hypotheses. (b) Perform the test (a ¼ :05). (c) Draw ﬁnal conclusions

Chapter 15

2. (a) How can the use of matched pairs be of help statistically? (b) What one single value can you compute from the results of a matched-pairs investigation that will tell you the degree to which the matching has helped?

12. You wish to see whether students perform differently on essay tests and on multiple choice tests. You select a sample of eight students enrolled in an introductory biology course and have each student take an essay test and a multiple-choice test. Both tests cover the same unit of instruction and are designed to assess mastery of factual knowledge. (Half the students take the essay test ﬁrst; the remaining half take the multiple-choice test ﬁrst.) The results are as follows: Student A B C D E F G H Essay: 43 39 44 47 30 46 34 41 Multiple choice: 45 33 46 49 28 43 36 37 Using the direct-difference method: (a) Set up the statistical hypotheses. (b) Compute D, SSD, and sD . (c) Perform the test (a ¼ :05). (d) Draw ﬁnal conclusions.

Chapter 16

1. Using the formula k(k 1)=2, determine the number of t tests required to make all possible pairwise comparisons for each of the following conditions: (a) k ¼ 2 (b) k ¼ 4 (c) k ¼ 6 (d) k ¼ 7

7. Study the following ANOVA summary, and then provide the missing information for the cells designated a–f: Source SS df MS F p Between-groups (a) 3 (b) (c) (d) Within-groups 64 (e) (f) Total 349 19

9. (a) How many groups are there in Problem 7? (How do you know?) (b) What is the total sample size in Problem 7? (How do you know?) (c) How many groups are there in Problem 8? (How do you know?) (d) What is the total sample size in Problem 8? (How do you know?)

Coladarci text

Chapter 14: Exercises 2, 4, 8, 9, 12, 16

Chapter 15: Exercises 2, 12

Chapter 16: Exercises 1, 7, 9 2.

Chapter 14

2. A graduate student wishes to compare the high school grade-point averages (GPAs) of males and females. He identiﬁes 50 brother/sister pairs, obtains the GPA for each individual, and proceeds to test H0: mmales mfemales ¼ 0. Are the methods discussed in this chapter appropriate for such a test? (Explain.)

4. Assume H0: m1 m2 ¼ 0 is true. What are the three deﬁning characteristics of the sampling distribution of differences between means?

8. Does familiarity with an assessment increase test scores? You hypothesize that it does. You identify 11 ﬁfth-grade students to take a writing assessment that they had not experienced before. Six of these students are selected at random and, before taking the assessment, are provided with a general overview of its rationale, length, question format, and so on. The remaining ﬁve students are not given this overview. The following are the scores (number of points) for students in each group: overview provided : 20; 18; 14; 22; 16; 16 no overview provided : 11; 15; 16; 13; 9 (a) Set up H0 and H1 (b) Perform the test (a ¼ :01). (c) Draw your ﬁnal conclusions.

9. An educational psychologist is interested in knowing whether the experience of attending preschool is related to subsequent sociability. She identiﬁes two groups of ﬁrst graders: those who had attended preschool and those who had not. Then each child is assigned a sociability score on the basis of observations made in the classroom and on the playground. The following sociability results are obtained: Attended Preschool Did Not Attend Preschool n1 ¼ 12; SX1 ¼ 204; SS1 ¼ 192 n2 ¼ 16; SX2 ¼ 248; SS2 ¼ 154 (a) Set up the appropriate statistical hypotheses. (b) Perform the test (a ¼ :05). (c) Draw ﬁnal conclusions.

12. Parametric statistical tests are tests that are based on one or more assumptions about the nature of the populations from which the samples are selected. What assumptions are required in the t test of H0: m1 m2 ¼ 0?

16. The director of Academic Support Services wants to test the efficacy of a possible intervention for undergraduate students who are placed on academic probation. She randomly assigns 28 such students to two groups. During the ﬁrst week of the semester, students in Group 1 receive daily instruction on speciﬁc strategies for learning and studying. Group 2 students spend the same time engaged in general discussion about the importance of doing well in college and the support services that are available on campus. At the end of the semester, the director determines the mean GPA for each group: Group 1 (Strategy Instruction) Group 2 (General Discussion) n1 ¼ 14; X1 ¼ 2:83; s1 ¼:41 n2 ¼ 14; X2 ¼ 2:26; s2 ¼ :39 (a) Set up the appropriate statistical hypotheses. (b) Perform the test (a ¼ :05). (c) Draw ﬁnal conclusions

Chapter 15

2. (a) How can the use of matched pairs be of help statistically? (b) What one single value can you compute from the results of a matched-pairs investigation that will tell you the degree to which the matching has helped?

12. You wish to see whether students perform differently on essay tests and on multiple choice tests. You select a sample of eight students enrolled in an introductory biology course and have each student take an essay test and a multiple-choice test. Both tests cover the same unit of instruction and are designed to assess mastery of factual knowledge. (Half the students take the essay test ﬁrst; the remaining half take the multiple-choice test ﬁrst.) The results are as follows: Student A B C D E F G H Essay: 43 39 44 47 30 46 34 41 Multiple choice: 45 33 46 49 28 43 36 37 Using the direct-difference method: (a) Set up the statistical hypotheses. (b) Compute D, SSD, and sD . (c) Perform the test (a ¼ :05). (d) Draw ﬁnal conclusions.

Chapter 16

1. Using the formula k(k 1)=2, determine the number of t tests required to make all possible pairwise comparisons for each of the following conditions: (a) k ¼ 2 (b) k ¼ 4 (c) k ¼ 6 (d) k ¼ 7

7. Study the following ANOVA summary, and then provide the missing information for the cells designated a–f: Source SS df MS F p Between-groups (a) 3 (b) (c) (d) Within-groups 64 (e) (f) Total 349 19

9. (a) How many groups are there in Problem 7? (How do you know?) (b) What is the total sample size in Problem 7? (How do you know?) (c) How many groups are there in Problem 8? (How do you know?) (d) What is the total sample size in Problem 8? (How do you know?)

Show More

Show Less

Was this answer helpful?

Describe your issueThe assistant will guide you

Chat 1:1 with a business tutorLicensed Experts are available 24/7

100% satisfaction guaranteeGet all the answers you need

Related Business and Finance Homework Questions

I need the answer to the questions: 1. A consultant for Dell

1. A consultant for Dell was investigating computer usage among students at a particular university. 200 undergraduates and 100 postgraduates were chosen and asked if they owned a laptop. It was found that 81 of the undergraduates and 63 of the postgraduates owned a laptop. The consultant calculated that 48% (144 out of 300) of the students interviewed owned a laptop. Explain, with reasons, whether the figure of 48% would be a good estimate of the proportion of all students who own a laptop. Hint: The answer is ‘Well James, it depends!', but obviously reasons are required! (10 marks) 2. A 95% confidence interval for the mean income of shop assistants in a certain city, based on a random sample of n shop assistants, is found to be (£18,000, £21,000). Explain what this means briefly (in at most 2–3 sentences). Would a 90% confidence interval be better than a 95% confidence interval? Justify your answer. Hint: The answer is ‘Well James, it depends!', but obviously reasons are required! (10 marks) 3. For a certain variable, the standard deviation in a large population is equal to 16. How large a random sample is needed to be 99% confident that the sample mean is within 2 units of the population mean? Would you recommend a confidence level other than 99%? Hint 1: Use the confidence interval Excel utility. Hint 2: The answer is ‘Well James, it depends!', but obviously reasons are required! (10 marks) 4. An accounting firm wishes to test the claim that no more than 6% of a large number of transactions contain errors. In order to test this claim, they examine a random sample of 225 transactions and find that exactly 20 of these are in error. What conclusion should the firm draw? Use a 5% significance level. Hint: Use the hypothesis testing Excel utility (one population). 5. Explain (in no more than a paragraph for each) the purpose of: (a) sampling (b) hypothesis testing. Discuss any advantages and limitations of each. 2 (10 marks) (10 marks) 6. A lumber company makes plywood for the furniture industry. One product it makes is 3/4-inch panels. It is very important that the panels conform to specifications. One specification calls for the panels to be made to an average thickness of 0.75 inches. Each hour, 5 panels are selected at random and measured. After 20 hours, a total of 100 panels have been measured (so the sample size is n = 100). The data are in the file ‘Lumber.xls'. (a) Based on the sample data, what should the company conclude about the status of its product meeting the thickness specification? Test at a 1% significance level. Discuss your results in a brief ‘executive summary' to the production manager. Hint: Use the hypothesis testing Excel utility (one population). (b) The production manager has looked at the results of your test. He wishes to repeat this sampling process and wants a rule to compare future X ̄ values only. So, based just on a sample mean of any new random sample of panels, without having to conduct a formal hypothesis test, he wishes to decide whether the thickness specification is being met, again using a 1% significance level. Develop a suitable rule. Hint: Use the hypothesis testing Excel utility (one population). (c) The manager wishes to know what type of error in (a) could have been made and what the potential consequences of the error might be. (25 marks) 7. A bookstore samples its order record to examine the number of days between placing an order and receiving the goods. The results (in days) are shown below. Assess and comment on the differences between surface transportation and air freight. You may use Excel! The data are in the file ‘Bookstore.xls'. Hint: This question is deliberately open-ended. You may investigate the data any way you like, for example calculating some descriptive statistics. Surface transportation 18 20 24 23 28 32 24 39 18 29 25 27 19 24 21 19 24 27 33 37 15 20 26 21 17 26 25 23 25 35 Air freight 12 12 13 21 18 14 9 16 18 14 13 11 15 11 17 14 12 13 11 17 19 16 14 14 12 … read more

you have answered them already but how do I get the answers?

I. Research Scenario: An organization wants to know if participants with varying levels of expertise (professionals, paraprofessionals, and nonprofessionals) improve their knowledge after completing a… read more

Resolved Question: 1 A 95% conﬁdence interval for the mean

Resolved Question: 1 A 95% conﬁdence interval for the mean income of shop assistants in a certain city is found to be (£12,000, £15,000). Say in one sentence what this means. Would a 99% conﬁdence int… read more

9.3 If you use a 0.10 level of significance in a two-tail hypothesis

9.3 If you use a 0.10 level of significance in a two-tail hypothesis test, what is your decision rule for rejecting a null hypothesis that the population mean is 500 if you use the Z test? For problem… read more

2. To answer the question, refer to the following list of raw

2. To answer the question, refer to the following list of raw data. 63, 71, 72, 77, 77, 78, 86, 77, 88, 88 What is the mode for the data? A. 77.7, B. 88, C. 77, D. 77.5 3. A population is a collection… read more

for rrjha I have another few questions over this week. Class

for rrjha I have another few questions over this week. Class – spend some time reviewing the chapter 6 reading assignment listed above as well as the documents I have left in the Course Materials Foru… read more

(For getsetgo) Please.QuestionUsing an MS Excel spreadsheet,

Question Using an MS Excel spreadsheet, compute the following information about a data set. The data set is shown in Table 1 below. There are three groups in the complete data set: Group 1—Learning vi… read more

4. A certain population of observations is bimodal (see Figure

4. A certain population of observations is bimodal (see Figure 3.10b). (a) Suppose you want to obtain a fairly accurate picture of the sampling distribution of means for random samples of size 3 drawn… read more

1 A 95% conﬁdence interval for the mean income of shop assistants

1 A 95% conﬁdence interval for the mean income of shop assistants in a certain city is found to be (£12,000, £15,000). Say in one sentence what this means. Would a 99% conﬁdence interval be better tha… read more

Question 1 of 20 5.0 Points The __________ test is useful

Question 1 of 20 5.0 Points The __________ test is useful for before/after experiments. A. goodness-of-fit B. sign C. median D. chi-square Reset Selection Mark for Review What's This? Question 2 of 20… read more

RRJha, I need the Module 7 work we discussed. Following

RRJha, I need the Module 7 work we discussed. Following is the format that the professor has said we must use to report the data (7 steps for each question). Thank you. Reporting Results Step 1: State… read more

Hello my question is for Business Statistics and it is Give

Hello my question is for Business Statistics and it is Give an example of a hypothesis test you could perform at work or at home. State what the Null and the Alternative hypotheses would be in your te… read more

Chapter 12 48. Time Magazine reported that in a 1994 survey

Chapter 12 48. Time Magazine reported that in a 1994 survey of 507 randomly selected adult American Catholics, 59% answered yes to the question, “Do you favor allowing women to be priests?” A. Set up … read more

It is recommended that people try to keep their cholesterol

It is recommended that people try to keep their cholesterol level below 200. The following Minitab output is for the control patients: test of mu = 200.00 vs mu < 200.00 Variable N Mean StDev SE Me… read more

Chapter 13 True/False 3. Audit sampling applies to control

Chapter 13 True/False 3. Audit sampling applies to control risk and detection risk. 10. In PPS sampling, the auditor chooses a logical sampling unit compatible with the nature of the auditing procedur… read more

Statistical Symbols and Definitions Matching Assignment

Statistical Symbols and Definitions Matching Assignment Match the letter of the definition on the right to the appropriate symbol on the left. Symbols 1. S (Uppercase Sigma) ____ 2. m (Mu) ____ 3. s (… read more

You have decided to do a research project. Describe

FOR CC I. You have decided to do a research project. Describe the project that you have decided on and then answer the following general knowledge questions as well as questions about your project. De… read more

13-36 (Mt. Hood Furniture PPS sampling problem) You have been

13-36 (Mt. Hood Furniture—PPS sampling problem) You have been assigned the task of testing the accuracy of the final inventory compilation for Mt. Hood Furniture. You may assume that you have separate… read more

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.

JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.

Web sites like justanswer.com/legal

...leave nothing to chance.

...leave nothing to chance.

Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.

Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.

I will tell you that...the things you have to go through to be an Expert are quite rigorous.

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Freshfield, Liverpool, UK

This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!!

Los Angeles, CA

Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult.

Hesperia, CA

I couldn't be more satisfied! This is the site I will always come to when I need a second opinion.

Kernersville, NC

Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around.

Woodstock, NY

Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know.

Elkton, Maryland

He answered my question promptly and gave me accurate, detailed information. If all of your experts are half as good, you have a great thing going here.

Dallas, TX

< Previous | Next >

linda_us

Master's Degree

852 satisfied customers

A tutor for Business, Finance, Accounts and other related topics.

F. Naz

Bachelor's Degree

608 satisfied customers

Have completed B.COM and CA Finalist

357 satisfied customers

dasdasd

Bizhelp

Accountant

260 satisfied customers

BA degree and Certified Public Accountant

Mr. Gregory White

Master's Degree

215 satisfied customers

M.A., M.S. Education / Educational Administration

Brittany

Professional

30 satisfied customers

AA/Accounting BS/Business

SusanAthena

Master's Degree

13 satisfied customers

12 years experience consulting & management

< Previous | Next >

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.