“What percent of customers wear rain jackets at Seattle Food Store each day?” In an attempt to answer that question, Dominique and Huong designed a study. They called the store manager and arranged to collect data for 20 days. The researchers collected data for 4 hours each day for 20 days and counted the total number of shoppers who did and did not wear a rain jacket. The average number of customers per day who wore a rain jacket during the sample period was 32.

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The population in this study was (read each answer and select the best one):

Select one:

a. All shoppers in Seattle.

b. All people who wear rain jackets.

c. All shoppers at the Seattle Food Store.

d. All shoppers at the Seattle Food Store during the study period.

e. The 32 people per day who wore rain jackets to the Seattle Food Store.

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The sample in this survey was:

Select one:

a. Dominique and Huong.

b. The people who were observed shopping at the Seattle Food Store during the study.

c. The people who wear rain jackets.

d. The four hours per day that were studied.

e. The 32 people per day who wore rain jackets to the Seattle Food Store.

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How would you describe the possibility that the sample was biased (read all answers and select the best one):

Select one:

a. There is no bias because the sample was large.

b. There is no bias because the multiple days were sampled.

c. There could be bias because the selected days might not be representative of all the days (such as changing weather).

d. Not enough information to determine the answer.

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Use this information for the next four questions: Researchers wanted to know about a standardized test that was used across the country. To get an estimate of the answer, they collected data from two classrooms of students who completed the test.

Scores from Classroom A:

8, 6, 9, 9, 8, 7, 8, 9, 10, 8, 10, 5, 4, 10, 9, 9

Scores from Classroom B:

9, 8, 7, 8, 9, 10, 9, 10, 7, 8, 10, 9, 9, 4, 6, 3

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The set of all scores on the standardized test across the country is:

Select one:

a. a statistic

b. a parameter

c. the sample

d. the population

Question 5

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When all the scores for the two classrooms are added and divided by the number of observations, the resulting value is a:

Select one:

a. a statistic

b. a parameter

c. the sample

d. the population

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What is the mean score in Group A?

Select one:

a. 8.4375

b. 8.3125

c. 8.0625

d. 8.375

e. 8.4375 / sqrt(n)

Question 7

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Load data for Group B into an R object called B, then run this command:

barplot(table(B))

What does the bar on the right represent?

Select one:

a. Nine students received a score of 5 on the quiz.

b. One student received a score of 6 on the quiz.

c. Three students received a score of 7 on the quiz.

d. Four students received a score of 9 on the quiz.

e. Three students received a score of 10 on th