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Chapter 4: Q. 11 (page 238)

Do you trust the Internet? You want to ask a sample of high school students the question 鈥淗ow much do you trust information about health that you find on the Internet鈥攁 great deal, somewhat, not much, or not at all?鈥� You try out this and other questions on a pilot group of 5students chosen from your class.

a. Explain how you would use a line of Table D to choose an SRS of 5students from the following list.

b. Use line 107to select the sample. Show how you use each of the digits.

Short Answer

Expert verified

a. From 1to 40, assign a number to each of the 40students.

b. Using line 107, skip the numbers not in bold:

8273957890208074751181676553009438314893609407.

Step by step solution

01

Part (a) Step 1 : Given Information

The sample of 40students is given

02

Part (a) Step 2 : Simplification

From 1to 40, assign a number to each of the 40students. On the random number table, choose a starting point. Make a list of two-digit numbers, skipping those that aren't between 01and 40and any that are repeated, until you have 5distinct numbers between 01and 40. Use the 5pupils who match these numbers.

03

Part (b) Step 1 : Given Information

The sample of 40 students is given

04

Part (b) Step 2 : Simplification

Using line 107, skip the numbers not in bold: 8273957890208074751181676553009438314893609407. Select Johnson (20), Drasin (11), Washburn (38), Rider (31), and Calloway (07).

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Most popular questions from this chapter

Layoffs and 鈥渟urvivor guilt鈥� Workers who survive a layoff of other employees at their location may suffer from 鈥渟urvivor guilt.鈥� A study of survivor guilt and its effects used as subjects 120students who were offered an opportunity to earn extra course credit by doing proofreading. Each subject worked in the same cubicle as another student, who was an accomplice of the experimenters. At a break midway through the work, one of three things happened:

Treatment 1: The accomplice was told to leave; it was explained that this was because she performed poorly.

Treatment 2: It was explained that unforeseen circumstances meant there was only enough work for one person. By 鈥渃hance,鈥� the accomplice was chosen to be laid off.

Treatment 3: Both students continued to work after the break. The subjects鈥� work performance after the break was compared with their performance before the break. Overall, subjects worked harder when told the other student鈥檚 dismissal was random.

Describe how you would randomly assign the subjects to the treatments

a. using slips of paper.

b. using technology.

c. using Table D.

Researchers randomly selected1700 people from Canada who had never suffered a

heart attack and rated the happiness of each person. Ten years later, the researchers

followed up with each person and found that people who were initially rated as happy

They were less likely to have a heart problem.

Which of the following is the most

appropriate conclusion based on this study?

a. Happiness causes better heart health for all people.

b. Happiness causes better heart health for Canadians.

c. Happiness causes better heart health for the1700people in the study.

d. Happier people in Canada are less likely to have heart problems.

e. Happier people in the study were less likely to have heart problems.

Got deodorant? A group of students wants to perform an experiment to determine

whether Brand Aor Brand Bdeodorant lasts longer. One group member suggests the

following design: Recruit 40student volunteers鈥�20male and20female. Separate by

gender, because male and female bodies might respond differently to deodorant. Give all

the males Brand Adeodorant and all the females Brand B. Have the principal judge how

well the deodorant is still working at the end of the school day on a 0to 10scale. Then

compare ratings for the two treatments.

a. Identify any flaws you see in the proposed design for this experiment.

b. Describe how you would design the experiment. Explain how your design addresses

each of the problems you identified in part (a).

A farmer is experimenting to determine which variety of apple trees, Fuji or Gala, will produce more fruit in his orchard. The orchard is divided into 20equally sized square plots. He has 10trees of each variety and randomly assigns each tree to a separate plot in the orchard. What is the experimental unit (s) in this study? a. The trees; b. The farmer; c. The plots d. The orchard e. The apples

You want to take a simple random sample (SRS) of 50of the816students who live in

a dormitory on campus. You label the students 001to816in alphabetical order. In the

table of random digits, you read the entries

9559294007697693354772450166328119414873

The first three students in your sample have labels.

a.955,929,400.b.400,769,769.c.559,294,007.d.929,400,769.e.400,769,335.
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