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Chapter 4: Q. 3 (page 236)

Students as customers A high school鈥檚 student newspaper plans to survey local

businesses about the importance of students as customers. From an alphabetical list of all

local businesses, the newspaper staff chooses 150businesses at random. Of these, 73

return the questionnaire mailed by the staff. Identify the population and the sample.

Short Answer

Expert verified

Population: 1000envelopes packed in an hour's time.

Sample: 40envelopes were chosen 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 more1000 envelopes packed in an hour's time.40 envelopes were chosen as a sample.

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Most popular questions from this chapter

Corn variety 1yielded 140bushels per acre last year at a research farm. This year, corn

variety 2, planted in the same location, yielded only 110bushels per acre. Based on these

results, is it reasonable to conclude that corn variety 1is more productive than corn variety

2?

a. Yes, because 140bushels per acre is greater than 110bushels per acre.

b. Yes, because the study was done at a research farm.

c. No, because there may be other differences between the two years besides the corn

variety.

d. No, because there was no use of a placebo in the experiment.

e. No, because the experiment wasn鈥檛 double-blind.

Boys don鈥檛 cry? Two female statistics students asked a random sample of 60 high school

boys if they have ever cried during a movie. Thirty of the boys were asked directly and the

other 30 were asked anonymously by means of a 鈥渟ecret ballot.鈥� When the responses were

anonymous, 63% of the boys said 鈥淵es,鈥� whereas only 23% of the other group said 鈥淵es.鈥�

Explain why the two percentages are so different.

In the experiment of the preceding exercise, the subjects were randomly assigned to the

different treatments. What is the most important reason for this random assignment?

a. Random assignment eliminates the effects of other variables such as stress and body

weight.

b. Random assignment is a good way to create groups of subjects that are roughly

equivalent at the beginning of the experiment.

c. Random assignment makes it possible to make a conclusion about all men.

d. Random assignment reduces the amount of variation in blood pressure.

e. Random assignment prevents the placebo effect from ruining the results of the study.

Improving response rate -How can we reduce the rate of refusals in telephone surveys? Most people who answer at all listen to the interviewer鈥檚 introductory remarks and then decide whether to continue. One study made telephone calls to randomly selected households to ask opinions about the next election. In some calls, the interviewer gave her name; in others, she identified the university she was representing; and in still others, she identified both herself and the university. For each type of call, the interviewer either did or did not offer to send a copy of the final survey results to the person interviewed.

a. List the factors in this experiment and state how many levels each factor has.

b. If the researchers used every possible combination to form the treatments, how many treatments were included in the experiment?

c. List two of the treatments.

Online polls Parade magazine posed the following question: 鈥淪hould drivers be banned

from using all cell phones?鈥� Readers were encouraged to vote online at parade.com. The

subsequent issue of Parade reported the results:2407(85%)said 鈥淵es鈥� and 410(15%)

said 鈥淣o.鈥�

a. What type of sample did the Parade survey obtain?

b. Explain why this sampling method is biased. Is 85%probably greater than or less than

the true percent of all adults who believe that all cell phone use while driving should be

banned? Why?
See all solutions

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