1. The manager of a popular clothing store wants to learn about the shopping habits of all of his customers, so he surveys a subset of his customers in order to help him draw conclusions about all of his customers. We would call all of the manger's customers a _______________________ and the subset of customers the manager surveys a _______________________.

Choose correct answer

a. sample; population

b. categorial variable; numerical variable

c. parameter; statistic

d. population; sample

e. statistic; parameter

2. Which one of the following statements is true?

Choose correct answer

a. To reduce bias, you should increase the size of a sample.

b. It's impossible for a sample mean to ever be negative.

c. A boxplot is a display of the five-number summary.

d. The interquartile range (or IQR) of a data set can never be equal to 0.

e. For a sample to be a simple random sample of size n, n must be a large number.

3. A study is designed to determine if drinking cranberry juice will have an impact on the number of cold symptoms a person experiences. A sample of 100 healthy adults volunteer to take part in this study. Half of these participants are randomly assigned to drink a glass of cranberry juice every day for six months. The other half of the participants are randomly assigned to drink a juice every day for six months that looks and tastes like cranberry juice but does not contain any actual cranberries. Over the course of the six-month period, participants keep careful records of their cold symptoms, and they report these symptoms at the end of the six-month period. If it is discovered that one subject did not follow the experiment instructions to drink the juice every day, we'd call that subject a

choose correct answer

a. nonadherer.

b. double-blind study.

c. statistically significant outcome.

d. placebo.

e. lurking variable.

4. The amount of time it takes residents of Columbus to commute to their jobs each day is Normal, with a mean of 35 minutes and a standard deviation of 4 minutes. The Empirical Rule tells us that approximately 68% of Columbus residents will take between how many minutes to commute to their jobs each day?

Choose correct answer

a. 29 minutes and 41 minutes

b. 34 minutes and 36 minutes

c. 23 minutes and 47 minutes

d. 27 minutes and 43 minutes

31 minutes and 39 minutes

5. The amount of time (in minutes) that it took a sample of 15 adults to solve a puzzle is presented in the table below. Which value in this data set is at the 25th percentile?

2

9

8

7

15

18

1

6

4

3

5

11

1

13

8

a. 2

b. 11

c. 6

d. 3

e. 7

6. Dr. Smith teaches over 1000 undergraduate students each semester. He would like to survey his students about their study habits. To obtain a sample of students to survey, Dr. Smith chooses every 20th student from an alphabetized list of all of his students. We call this type of a sampling method a(n)

Choose correct answer

a. systematic sampling method.

b. voluntary response sampling method.

c. stratified random sampling method.

d. experimental sampling method.

e. simple random sampling method.

7. What might impact the ability to remember words presented in a list? A researcher has a theory that the style of font used may have an impact on memory. An experiment is designed in which subjects are randomly assigned to memorize a list of 20 words displayed in either Arial font, Comic Sans font, Garamond font, or Times New Roman font. After spending 10 minutes memorizing the words, the subjects are asked to recall as many words as they can remember. How many treatments are included in this experiment?

Choose correct answer

a. Three

b. Five

c. One

d. Two

e. Four

8. When we are talking about the objects described by a set of data, we are referring to

Choose correct answer

a. a census.

b. variability.

c. individuals.

d. bias.

e. undercoverage.

9. The prices of wedding cakes sold at a particular bakery follow a Normal distribution, with a mean of $500 and a standard deviation of $85. What percentage of wedding cakes in this distribution cost more than $636? Choose the answer below that is closest to what you calculate.

Choose correct answer

a. 5.48%

b. More than 25%

c. 24.20%

d. 1.79%

e. 3.59%

10. A sample consisting of n = 1,500 college students from a large Midwestern university was asked to indicate the reasons why they use social media. The responses given by the sample are included in the table below. Based on what you know about the sample and what you see in the table, what conclusion should you draw?

Response	Percentage
Stay up to date with news and current events	37%
Find funny or entertaining content	35%
Fill up spare time	34%
Stay in touch with what my friends are doing	33%
Share photos or videos with others	28%
Research products to buy	28%
General networking with other people	27%
Because a lot of my friends use social media	25%
Share my opinion	23%
Meet new people	21%

Choose correct answer

A. A line graph should be used to display the data from this table.

B. We should consider "reason for using social media" to be a numerical variable.

C. None of the other answer options are correct conclusions to draw based on this information.

D. A total of 350 students in the sample indicated they use social media to find funny or entertaining content.

E. Although a bar graph would be appropriate to use to graph this data, a pie chart would be inappropriate.