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Chapter 4: Q. 51 (page 263)

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.

Short Answer

Expert verified

a. The factors in this experiment are introductory remarks , opinions about elections ,name and university and response rate .

b. Treatments were included in the experiment six

c. Two of the treatments are opinion about election and offering copy of survey.

Step by step solution

01

Part (a) Step 1: Given information

We need to find that List the factors in this experiment and state how many levels each factor has.

02

 Part (a) Step 2: Explanation

The factors during this experiment are -
The response variable can be defined as that the focus of a question in a study or experiment. An explanatory variable can be defined as one that explains changes therein variable.
Explanatory variables = introductory remarks , opinions about elections ,name and university

Response variables= response rate

03

Part (b) Step 1: Given information

We need to find that the researchers used every possible combination to form the treatments, how many treatments were included in the experiment

04

 Part (b) Step 2: Explanation

In an experiment, the n an experiment, the issue (additionally known as an impartial variable) is an explanatory variable manipulated with the aid of using the experimenter. Each issue has or greater levels, i.e., exceptional values of the issue. Combination of various levels are known as remedies. In this example six remedies had been adopted .

05

Part (c) Step 1: Given information

We need to find that two of the treatments .

06

 Part (c) Step 2: Explanation

The two different treatments are asking opinions about the next election to random person and offering to send a copy of the final survey results to the person interviewed.

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Most popular questions from this chapter

Reducing unemployment Will cash bonuses speed the return to work of unemployed people? A state department of labor notes that last year 68%of people who filed claims for unemployment insurance found a new job within 15weeks. As an experiment, this year the state offers $500to people filing unemployment claims if they find a job within 15weeks. The percent who do so increases to 77%. What flaw in the design of this experiment makes it impossible to say if the bonus really caused the increase? Explain your answer.

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

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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.

Doctors and nurses Nurse-practitioners are nurses with advanced qualifications who often act much like primary-care physicians. Are they as effective as doctors at treating patients with chronic conditions? An experiment was conducted with 1316patients who had been diagnosed with asthma, diabetes, or high blood pressure. Within each condition, patients were randomly assigned to either a doctor or a nurse-practitioner. The response variables included measures of the patients' health and of their satisfaction with their medical care after 6months.50

a. Which are the blocks in this experiment: the different diagnoses (asthma, diabetes, or high blood pressure) or the type of care (nurse or doctor)? Why?

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c. Suppose the experiment used only diabetes patients, but there were still 1316subjects willing to participate. What advantage would this offer? What disadvantage?

A simple random sample of 1200 adult Americans is selected, and each person is asked

the following question: 鈥淚n light of the huge national deficit, should the government at this

time spend additional money to send humans to Mars?鈥� Only 39% of those responding

answered 鈥淵es.鈥� This survey

a. is reasonably accurate because it used a large simple random sample.

b. needs to be larger because only about 24 people were drawn from each state.

c. probably understates the percent of people who favor sending humans to Mars.

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e. probably overstates the percent of people who favor sending humans to Mars.

Sampling gravestones The local genealogical society in Coles County, Illinois, has compiled records on all 55,194gravestones in cemeteries in the county for the years 1825to 1985. Historians plan to use these records to learn about African Americans in Coles County鈥檚 history. They first choose an SRS of 395records to check their accuracy by visiting the actual gravestones.

a. Explain how you would use a random number generator to choose the SRS. Your description should be clear enough for a classmate to carry out your plan.

b. Use your method from part (a) to choose the first 3gravestones
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