Calculus and Above

Calculus Questions? Ask a Mathematician for Answers ASAP

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

"StatsPro" 21. Which of the following...

"StatsPro"

21. Which of the following statements are true?

I. Random sampling is a good way to reduce response bias.

II. To guard against bias from undercoverage, use a convenience sample.

III. Increasing the sample size tends to reduce survey bias.

IV. To guard against nonresponse bias, use a mail-in survey.

22. Suppose X and Y are independent random variables. The variance of X is equal to 16; and the variance of Y is equal to 9. Let Z = X - Y.

What is the standard deviation of Z?

(A) 2.65

(B) 5.00

(C) 7.00

(D) 25.0

(E) It is not possible to answer this question, based on the information given.

23. Acme Toy Company sells baseball cards in packages of 100. Three types of players are represented in each package -- rookies, veterans, and All-Stars. The company claims that 30% of the cards are rookies, 60% are veterans, and 10% are All-Stars. Cards from each group are randomly assigned to packages.

Suppose you bought a package of cards and counted the players from each group. What method would you use to test Acme's claim that 30% of the production run are rookies; 60%, veterans; and 10%, All-Stars.

(A) Chi-square goodness of fit test

(B) Chi-square test for homogeneity

(C) Chi-square test for independence

(D) One-sample t test

(E) Matched pairs t-test

24. Suppose a researcher conducts an experiment to test a hypothesis. If she doubles her sample size, which of the following will increase?

I. The power of the hypothesis test.

II. The effect size of the hypothesis test.

III. The probability of making a Type II error.

(A) I only

(B) II only

(C) III only

(D) All of the above

(E) None of the above

25. Suppose a die is tossed 5 times. What is the probability of getting exactly 2 fours?

(A) 0.028

(B) 0.161

(C) 0.167

(D) 0.333

(E) There is not enough information to answer this question.

21. Which of the following statements are true?

I. Random sampling is a good way to reduce response bias.

II. To guard against bias from undercoverage, use a convenience sample.

III. Increasing the sample size tends to reduce survey bias.

IV. To guard against nonresponse bias, use a mail-in survey.

22. Suppose X and Y are independent random variables. The variance of X is equal to 16; and the variance of Y is equal to 9. Let Z = X - Y.

What is the standard deviation of Z?

(A) 2.65

(B) 5.00

(C) 7.00

(D) 25.0

(E) It is not possible to answer this question, based on the information given.

23. Acme Toy Company sells baseball cards in packages of 100. Three types of players are represented in each package -- rookies, veterans, and All-Stars. The company claims that 30% of the cards are rookies, 60% are veterans, and 10% are All-Stars. Cards from each group are randomly assigned to packages.

Suppose you bought a package of cards and counted the players from each group. What method would you use to test Acme's claim that 30% of the production run are rookies; 60%, veterans; and 10%, All-Stars.

(A) Chi-square goodness of fit test

(B) Chi-square test for homogeneity

(C) Chi-square test for independence

(D) One-sample t test

(E) Matched pairs t-test

24. Suppose a researcher conducts an experiment to test a hypothesis. If she doubles her sample size, which of the following will increase?

I. The power of the hypothesis test.

II. The effect size of the hypothesis test.

III. The probability of making a Type II error.

(A) I only

(B) II only

(C) III only

(D) All of the above

(E) None of the above

25. Suppose a die is tossed 5 times. What is the probability of getting exactly 2 fours?

(A) 0.028

(B) 0.161

(C) 0.167

(D) 0.333

(E) There is not enough information to answer this question.

Show More

Show Less

Was this answer helpful?

Describe your issueThe assistant will guide you

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

100% satisfaction guaranteeGet all the answers you need

Related Calculus and Above Questions

Determine whether run times vary by position for baseball

Determine whether run times vary by position for baseball players. Start by performing ANOVA. Then do post-hoc tests and write a conclusion. Remember that greater times mean slower runners. Assume the… read more

Need these within the hour, thanks for your help! QUESTION 1

Need these within the hour, thanks for your help!QUESTION 1 Use analysis of variance rather than a t test whenever the null hypothesis makes a claim about: A: the population variance B: the population… read more

I noted someone had already asked these 28 questions. I am

I noted someone had already asked these 28 questions. I am also needing the answers. Question 1 Your study examines self-esteem scores. Your participants complete a self-esteem questionnaire and self-… read more

This is a two-part, timed assignment. These are all multiple

This is a two-part, timed assignment. These are all multiple choice, so they should be somewhat easier. When you're finished with Part 1 I'll post the second.1) Use analysis of variance rather than a … read more

A Chi square test has been conducted to assess the relationship

A Chi square test has been conducted to assess the relationship between marital status and church attendance. The obtained Chi square is 23.45 and the critical Chi square is 9.488. What may be conclud… read more

Above 1. Given the significance level 0.025, the F-value for

Above 1. Given the significance level 0.025, the F-value for the degrees of freedom, df = (7,3) is A. 14.62. B. 8.45. C. 27.67. D. 5.89. 2. Which of the following statements are true regarding the sim… read more

Pen Foster Exam 250714RR1. Another name for the residual

Penn Foster Exam 250714RR 1. Another name for the residual term in a regression equation is A. residual analysis. B. random error. C. homoscedasticity. D. pooled variances. 2. A chi-square test for in… read more

1. The smaller the p-value, the more we doubt the null hypothesis?

1. The smaller the p-value, the more we doubt the null hypothesis? True or False. 2. If a null hypothesis is not rejected at a significance level of .05, it will ____ be rejected at a significance lev… read more

Below are 8 questions that I need answers for. I do not need

Below are 8 questions that I need answers for. I do not need to see the work. I only need to have the correct answer. I have also provided the possible correct answers. 1. the mistake of rejecting the… read more

14) Sound engineers studied factors that might affect the output,

14) Sound engineers studied factors that might affect the output, in decibels, of a rock concert's speaker system. The desired level of significance was a = .05. The results of their ANOVA tests are s… read more

"StatsPro" Last group and YOU HAVE A GREAT HOLIDAY -see

"StatsPro" Last group and YOU HAVE A GREAT HOLIDAY -see you again in January... 36.A sports writer hypothesized that Tiger Woods plays better on par 3 holes than on par 4 holes. He reviewed Woods' per… read more

"StatsPro" 16.Suppose a simple random sample of 150 students

"StatsPro" 16.Suppose a simple random sample of 150 students is drawn from a population of 3000 college students. Among sampled students, the average IQ score is 115 with a standard deviation of 10. W… read more

"StatsPro" Next ones 6. A card is drawn randomly from a

"StatsPro" Next ones 6. A card is drawn randomly from a deck of ordinary playing cards. You win $10 if the card is a spade or an ace. What is the probability that you will win the game? (A) 1/13 (B) 1… read more

"StatsPro" 26. Which of the following statements are true?

"StatsPro" 26. Which of the following statements are true? (Check one) I. A sample survey is an example of an experimental study. II. An observational study requires fewer resources than an experiment… read more

Hey "StatsPro" - I have a 90 minute times AP test today. Would

Hey "StatsPro" - I have a 90 minute times AP test today. Would you be available to help? It is 90 minutes with 40 multiple choice questions. Woudl it be ok to send with 5 questions on each post to you… read more

"StatsPro" 31. An archer claims that 25% of her shots will

"StatsPro" 31. An archer claims that 25% of her shots will be in the center of the target (i.e., a bulls-eye). A sports writer plans to test this claim by sampling 300 shots. If the 300 shots result i… read more

"StatsPro" next group for my test 11. Which of the following

"StatsPro" next group for my test 11. Which of the following statements are true? (Check one) I. A sample survey is an example of an experimental study. II. An observational study requires fewer resou… read more

"StatsPro" Next one today The Acme Battery Company has

"StatsPro" Next one today The Acme Battery Company has developed a new cell phone battery. On average, the battery lasts 60 minutes on a single charge. The standard deviation is 4 minutes. Suppose the… 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 >

rajeevanpillai

Master's Degree

1,296 satisfied customers

B.Sc Mathematics and M.Sc, M Phil Statistics

Mr. Gregory White

Master's Degree

114 satisfied customers

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

SusanAthena

Master's Degree

102 satisfied customers

Tutor for Algebra, Geometry, Statistics. Explaining math in plain English.

Dr Arthur Rubin

Doctoral Degree

96 satisfied customers

Ph.D. in Mathematics, 1978, from the California Institute of Technology, over 20 published papers

JACUSTOMER-yrynbdjl-

Master's Degree

42 satisfied customers

I have a MS in Mathematics and I have taught Mathematics for 10 years at the college level.

dhouse1940

Master's Degree

33 satisfied customers

BS mathematics, MS biostatistics, 35+ yrs designing & analyzing biological experiments.

Don

Master's Degree

29 satisfied customers

M.S. Astronautical Engineering. Math/Sci/Comp Tutor

< 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.