How JustAnswer Works:

  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.

Ask Ryan Your Own Question

Ryan
Ryan, Engineer
Category: Calculus and Above
Satisfied Customers: 7265
Experience:  B.S. in Civil Engineering
Type Your Calculus and Above Question Here...
Ryan is online now
A new question is answered every 9 seconds

1) The main purpose of descriptive statistics is to A. summarize

Customer Question

1) The main purpose of descriptive statistics is to
A. summarize data in a useful and informative manner
B. make inferences about a population
C. determine if the data adequately represents the population
D. gather or collect data

2) The general process of gathering, organizing, summarizing, analyzing, and interpreting data is called
A. statistics
B. descriptive statistics
C. inferential statistics
D. levels of measurement

3) The performance of personal and business investments is measured as a percentage, return on investment. What type of variable is return on investment?
A. Qualitative
B. Continuous
C. Attribute
D. Discrete

4) What type of variable is the number of robberies reported in your city?
A. Attribute
B. Continuous
C. Discrete
D. Qualitative

5) What level of measurement is the number of auto accidents reported in a given month?
A. Nominal
B. Ordinal
C. Interval
D. Ratio

6) The names of the positions in a corporation, such as chief operating officer or controller, are examples of what level of measurement?
A. Nominal
B. Ordinal
C. Interval
D. Ratio

7) Shoe sizes, such as 7B, 10D, and 12EEE, are examples of what level of measurement?
A. Nominal
B. Ordinal
C. Interval
D. Ratio

8) Monthly commissions of first-year insurance brokers are $1,270, $1,310, $1,680, $1,380, $1,410, $1,570, $1,180, and $1,420. These figures are referred to as
A. a histogram
B. raw data
C. frequency distribution
D. frequency polygon

9) A small sample of computer operators shows monthly incomes of $1,950, $1,775, $2,060, $1,840, $1,795, $1,890, $1,925, and $1,810. What are these ungrouped numbers called?
A. Histogram
B. Class limits
C. Class frequencies
D. Raw data

10) The sum of the deviations of each data value from this measure of central location will always be 0
A. Mode
B. Mean
C. Median
D. Standard deviation

11) For any data set, which measures of central location have only one value?
A. Mode and median
B. Mode and mean
C. Mode and standard deviation
D. Mean and median

12) A sample of single persons receiving social security payments revealed these monthly benefits: $826, $699, $1,087, $880, $839, and $965. How many observations are below the median?
A. 0
B. 1
C. 2
D. 3
13) A dot plot shows
A. the general shape of a distribution
B. the mean, median, and mode
C. the relationship between two variables
D. the interquartile range

14) The test scores for a class of 147 students are computed. What is the location of the test score associated with the third quartile?
A. 111
B. 37
C. 74
D. 75%

15) The National Center for Health Statistics reported that of every 883 deaths in recent years, 24 resulted from an automobile accident, 182 from cancer, and 333 from heart disease. Using the relative frequency approach, what is the probability that a particular death is due to an automobile accident?
A. 24/883 or 0.027
B. 539/883 or 0.610
C. 24/333 or 0.072
D. 182/883 or 0.206

16) If two events A and B are mutually exclusive, what does the special rule of addition state?
A. P(A or B) = P(A) + P(B)
B. P(A and B) = P(A) + P(B)
C. P(A and/or B) = P(A) + P(B)
D. P(A or B) = P(A) - P(B)

17) A listing of all possible outcomes of an experiment and their corresponding probability of occurrence is called a
A. random variable
B. probability distribution
C. subjective probability
D. frequency distribution

18) The shape of any uniform probability distribution is
A. negatively skewed
B. positively skewed
C. rectangular
D. bell shaped

19) The mean of any uniform probability distribution is
A. (b - a)/2
B. (a + b)/2
C. Σ x/ η
D. nπ

20) For the normal distribution, the mean plus and minus 1.96 standard deviations will include about what percent of the observations?
A. 50%
B. 99.7%
C. 95%
D. 68%

21) For a standard normal distribution, what is the probability that z is greater than 1.75?
A. 0.0401
B. 0.0459
C. 0.4599
D. 0.9599

22) A null hypothesis makes a claim about a
A. A null hypothesis makes a claim about a
B. sample statistic
C. sample mean
D. Type II error

23) What is the level of significance?
A. Probability of a Type II error
B. Probability of a Type I error
C. z-value of 1.96
D. Beta error

24) Suppose we test the difference between two proportions at the 0.05 level of significance. If the computed z is -1.07, what is our decision?
A. Reject the null hypothesis
B. Do not reject the null hypothesis
C. Take a larger sample
D. Reserve judgment

25) Which of the following conditions must be met to conduct a test for the difference in two sample means?
A. Data must be at least of interval scale
B. Populations must be normal
C. Variances in the two populations must be equal
D. Data must be at least of interval scale and populations must be normal

26) Which of the following statements about the two sample sizes is NOT true? Assume the population standard deviations are equal.
A. Sample A = 11; sample B = 13
B. Sample A = 12; sample B = 14
C. Sample A = 13; sample B = 13
D. Sample A = 10; sample B = 16

27) What is the chart called when the paired data (the dependent and independent variables) are plotted?
A. Scatter diagram
B. Bar chart
C. Pie chart
D. Histogram

28) What is the variable used to predict the value of another called?
A. Independent variable
B. Dependent variable
C. Correlation variable
D. Variable of determination

29) Twenty randomly selected statistics students were given 15 multiple-choice questions and 15 open-ended questions, all on the same material. The professor was interested in determining on which type of questions the students scored higher. This experiment is an example of
A. a one sample test of means
B. a two sample test of means
C. a paired t-test
D. a test of proportions

30) The measurements of weight of 100 units of a product manufactured by two parallel processes have same mean but the standard of process A is 15 while that of B is 7. What can you conclude?
A. The weight of units in process A are grouped closer than in process B
B. The weight of units in process B are grouped closer than in process A
C. Both processes are out of control
D. More data is needed to draw a conclusion
Submitted: 1 year ago.
Category: Calculus and Above
Expert:  Ryan replied 1 year ago.
Hi,

Thank you for using JustAnswer.

I'll be happy to help you with these statistics questions.

Could you please clarify a couple of the questions though?

In #22, the answer choice "A" seems to repeat the question, rather than offfering an answer. Could you check this please?

Question #26 asks "Which of the following statements about the two sample sizes is NOT true?", but it is not clear what samples the question is referring to. Is there more information that goes with this question? Is there a figure or chart of some kind?


Thanks,

Ryan
Customer: replied 1 year ago.


Hey Ryan,


 


I believe choice "A" for question 22 is...population parameter


 


On question 26 I have no idea...if you can't answer then no worries.


Sorry for the confusion.


 

Expert:  Ryan replied 1 year ago.
Hi,

Ok, thanks for the clarification. I'll have these posted for you shortly.

Thanks,

Ryan
Expert:  Ryan replied 1 year ago.
Hi,

Here are the solutions:

Stats

Please feel free to ask if you have any questions about these answers.

Thanks,

Ryan
Customer: replied 1 year ago.


Thank you so much.

Expert:  Ryan replied 1 year ago.
Hi,

You're quite welcome. I'm glad that I could help.

Thanks,

Ryan

JustAnswer in the News:

 
 
 
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.
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.
 
 
 

What Customers are Saying:

 
 
 
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. Freshfield, Liverpool, UK
< Last | Next >
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. 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!!!! Alex 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. GP Hesperia, CA
  • I couldn't be more satisfied! This is the site I will always come to when I need a second opinion. Justin 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. Esther 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. Robin 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. Diane Dallas, TX
 
 
 

Meet The Experts:

 
 
 
  • Mr. Gregory White

    Master's Degree

    Satisfied Customers:

    90
    M.A., M.S. Education / Educational Administration
< Last | Next >
  • http://ww2.justanswer.com/uploads/ED/educatortech/2012-6-7_1256_williams4.64x64.jpg Mr. Gregory White's Avatar

    Mr. Gregory White

    Master's Degree

    Satisfied Customers:

    90
    M.A., M.S. Education / Educational Administration
  • http://ww2.justanswer.com/uploads/homeworklady/2008-11-24_125231_susannewavatar.jpg SusanAthena's Avatar

    SusanAthena

    Master's Degree

    Satisfied Customers:

    86
    Tutor for Algebra, Geometry, Statistics. Explaining math in plain English.
  • http://ww2.justanswer.com/uploads/SO/sonofGauss/2012-6-6_20151_PortraitLHW.64x64.jpg JACUSTOMER-yrynbdjl-'s Avatar

    JACUSTOMER-yrynbdjl-

    Master's Degree

    Satisfied Customers:

    42
    I have a MS in Mathematics and I have taught Mathematics for 10 years at the college level.
  • http://ww2.justanswer.com/uploads/dhouse1940/2010-09-02_133023_DSCN2406.jpg dhouse1940's Avatar

    dhouse1940

    Master's Degree

    Satisfied Customers:

    33
    BS mathematics, MS biostatistics, 35+ yrs designing & analyzing biological experiments.
  • http://ww2.justanswer.com/uploads/CO/CosumelEyes/2012-5-4_4923_Profile.64x64.jpg Ray Atkinson's Avatar

    Ray Atkinson

    Bachelor's Degree

    Satisfied Customers:

    30
    Degrees in Math, Education and Accounting, years and years of tutoring.
  • http://ww2.justanswer.com/uploads/DO/Donbacongamer/2012-3-6_2337_mathmaster.64x64.jpg Don's Avatar

    Don

    Master's Degree

    Satisfied Customers:

    29
    M.S. Astronautical Engineering. Math/Sci/Comp Tutor
  • http://ww2.justanswer.com/uploads/AR/arubin9/2012-2-4_42617_ArthurRubinedit.64x64.jpg Dr Arthur Rubin's Avatar

    Dr Arthur Rubin

    Doctoral Degree

    Satisfied Customers:

    26
    Ph.D. in Mathematics, 1978, from the California Institute of Technology, over 20 published papers
 
 
 

Related Calculus and Above Questions