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Chapter 4: Q. 4 (page 236)

Customer satisfaction A department store mails a customer satisfaction survey to people

who make credit card purchases at the store. This month, 45000people made credit card

purchases. Surveys are mailed to 1000of these people, chosen at random, and 137people

return the survey form. Identify the population and the sample.

Short Answer

Expert verified

Population: The 45000people who used their credit cards to make purchases.

Sample: The 137people who replied to the survey were used as a sample.

Step by step solution

01

Given information

We have to find the population and the sample.

02

Explanation

A sample survey picks a group of people from a larger group of people about whom we wish to learn more.The 45000people who used their credit cards to make purchases..The 137people who replied to the survey were used as a sample.

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Most popular questions from this chapter

Checking for bias Comment on each of the following as a potential sample survey

question. Is the question clear? Is it slanted toward a desired response?

a. Which of the following best represents your opinion on gun control?

i. The government should confiscate our guns.

ii. We have the right to keep and bear arms.

b. A freeze in nuclear weapons should be favored because it would begin a much-needed

process to stop everyone in the world from building nuclear weapons now and reduce

the possibility of nuclear war in the future. Do you agree or disagree?

Meditation for anxiety An experiment that claimed to show that meditation lowers anxiety proceeded as follows. The experimenter interviewed the subjects and rated their level of anxiety. Then the subjects were randomly assigned to two groups. The experimenter taught one group how to meditate and they meditated daily for a month. The other group was simply told to relax more. At the end of the month, the experimenter interviewed all the subjects again and rated their anxiety level. The meditation group now had less anxiety. Psychologists said that the results were suspect because the ratings were not blind. Explain what this means and how lack of blindness could affect the reported results.

Miami's car colorsUsing a webcam, a traffic analyst selected a random sample of 800cars traveling on I-195in Miami on a weekday morning. Among the 800cars in the sample, 24%were white. The margin of error for this estimate is 3.0percentage points.

a. Would you be surprised if a census revealed that 26%of cars onI-195 in Miami on a weekday morning were white? Explain your answer.

b. Explain how the traffic analyst could decrease the margin of error.

Animal testing (1.1) 鈥淚t is right to use animals for medical testing if it might save human lives.鈥� The General Social Survey asked 1152adults to react to this statement. Here is the two-way table of their responses:

Opinion about using animals for medical testing :


MaleFemaleTotal
Strongly agree76
59
135
Agree270
247
517
Neither agree nor disagree87
139
226
Disagree61
123
184
Strongly disagree22
68
90
Total516
636
1152

a. Construct segmented bar graphs to display the distribution of opinion for males and for females. b. Is there an association between gender and opinion for the members of this sample? Explain your answer

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.
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