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Chapter 4: Q. 1 (page 236)

Sampling stuffed envelopes A large retailer prepares its customers鈥�

monthly credit card bills using an automatic machine that folds the bills, stuffs them into

envelopes, and seals the envelopes for mailing. Are the envelopes completely sealed?

Inspectors choose 40envelopes at random from the 1000stuffed each hour for visual

inspection. Identify the population and the sample.

Short Answer

Expert verified

Population: all local businesses.

Sample : 40.

Step by step solution

01

Given information

We have to find the population and sample.

02

Explanation

A sample survey picks a group of people from a larger group of people about whom we wish to learn more.

Population: all local businesses.

Sample : 40.

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Most popular questions from this chapter

Nonresponse A survey of drivers began by randomly sampling from all listed residential

telephone numbers in the United States. Of 45,956 calls to these numbers, 5029 were

completed. The goal of the survey was to estimate how far people drive, on average, per

day. Describe how nonresponse might lead to bias in this study. Explain the likely

direction of the bias.

A recent random sample of n=805adult U.S. residents found that the proportion who rated the honesty and ethical standards of nurses as high or very high is 0.85. This is 0.15higher than the proportion recorded for doctors, the next highest-ranked profession.

a. Identify the sample and the population in this setting.

b. Do you think that the proportion of all U.S. residents who would rate the honesty and ethical standards of nurses as high or very high is exactly 0.85? Explain your answer.

c. What is the benefit of increasing the sample size in this context?

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.

Two essential features of all statistically designed experiments are

a. comparing several treatments; using the double-blind method.

b. comparing several treatments; using chance to assign subjects to treatments.

c. always having a placebo group; using the double-blind method.

d. using a block design; using chance to assign subjects to treatments.

e. using enough subjects; always having a control group.

A report in a medical journal notes that the risk of developing Alzheimer鈥檚 disease among subjects who regularly opted to take the drug ibuprofen was about half the risk of those who did not. Is this good evidence that ibuprofen is effective in preventing Alzheimer鈥檚 disease?

a. Yes, because the study was a randomized, comparative experiment.

b. No, because the effect of ibuprofen is confounded with the placebo effect.

c. Yes, because the results were published in a reputable professional journal.

d. No, because this is an observational study. An experiment would be needed to confirm

(or not confirm) the observed effect.

e. Yes, because a 50%reduction can鈥檛 happen just by chance.
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