# statistics The Gallup Organization contacts 1709 adult men

January 30, 2017

Question
Week 1 Quiz

1. The Gallup Organization contacts 1709 adult men who are 40 to 60 yrs of age and live in the United States and asks whether or not they had seen their family doctor within the past 6 months.

What is the population in the study? Choose from the answers from below:

a) Adult men who are 40 to 60 yrs of age

b) Adult men who are 40 to 40 to 60 yrs of age and have seen their family doctor

c) Adult men who are 40 to 60 yrs of age and live in the United States

d) Adult men who are 40 to 60 yrs of age and live in the United States and have seen their family doctor

What is the sample in the study? Choose from the answers from below:

a) The 1709 adult men who are 40 to 60 yrs of age and live in the United States

b) Adult men who are 40 to 60 yrs of age

c) Adult men who are 40 to 60 of age and live in the United States

d) The 1709 adult men who are 40 to 60 yrs of age and live in the United States and have seen their family doctor

2. What is 94% of 200?

3. Identify the type of observational study (cross-sectional, retrospective, or prospective) described below.

A research company uses a device to record the viewing habits of about 15,000 households, and the data collected over the past 2 yrs will be used to determine whether the proportion of households tuned to a particular sports program increased. Which type of observational study is described in the problem statement? Choose from the answers below:

a) Retrospective study

b) Prospective study

c) Cross-sectional study

4. Listed below are the durations (in hours) of a simple random sample of all flights of a space shuttle program. Find the range, variance, and standard deviation for the sample data. Is the lowest duration time usual? Why or why not.

75 98 234 191 161 264 190 374 254 231 390 330 227 246 0

SHOW WORK

a) The range of the sample data is _______ hours. (Enter integer or decimal)

b) The variance of the sample data is _______. (Enter integer or decimal)

c) The standard deviation of the sample data is _______. (Enter integer or decimal)

Is the lowest duration time usual? Why or why not? Choose from the answers below:

a) No, because it is within two standard deviations of the mean

b) No because the sample is random

c) Yes, because the lowest value in a data set is usually an outlier

d) Yes, because it is more than two standard deviations below the mean

5. Which is relatively better: a score of 79 on a psychology test or a score of 38 on an economics test? Scores on the psychology test have a mean of 89 and a standard deviation of 14. Scores on the economics test have a mean of 51 and a standard deviation of 10. Choose the correct answer from the choices below:

a) The psychology test score is relatively better because its z score is less than the z score for the economics test score

b) The economics test score is relatively better because its z score is less than the z score for the psychology test score

c) The economics test score is relatively better because its z score is greater than the z score for the psychology test score

d) The psychology test score is relatively better because its z score is greater than the z score for the economics test score

6. Find the third quartile Q3 of the list of 24 sorted values shown below:

SHOW WORK

30 30 34 39 41 42 42 42 49 49 50 50 51 51 54 55 57 52 66 67 73 73 77 79

The third quartile Q3 is _______. (Enter integer or decimal)

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