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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 “How much do you trust information about health that you find on the Internet—a great deal, somewhat, not much, or not at all?” 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

Can texting make you healthier? Researchers randomly assigned 700Australian adults

to either receive usual health care or usual heath care plus automated text messages with

positive messages, such as “Walking is cheap. It can be done almost anywhere. All you

need is comfortable shoes and clothing.” The group that received the text messages

showed a statistically significant increase in physical activity“statistically significant” in this context?

a. The results of this study are very important.

b. The results of this study should be generalized to all people.

c. The difference in physical activity for the two groups is greater than 0.

d. The difference in physical activity for the two groups is very large.

e. The difference in physical activity for the two groups is larger than the difference

that could be expected to happen by chance alone.

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?

b. Explain why a randomized block design is preferable to a completely randomized design in this context.

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

Anonymous? Confidential? Texas A & M, like many universities, offers screening for HIV, the virus that causes AIDS. Students may choose either anonymous or confidential screening. An announcement says, “Persons who sign up for screening will be assigned a number so that they do not have to give their name.” They can learn the results of the test by telephone, still without giving their name. Does this describe anonymous or confidential screening? Why?

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.

Unequal benefitsResearchers on aging proposed investigating the effect of

supplemental health services on the quality of life of older people. Eligible patients on

The rolls of a large medical clinic were to be randomly assigned to treatment and control.

groups. The treatment group would be offered hearing aids, dentures, transportation, and other services not available without charge to the control group. The review board believed that providing these services to some but not other people in the same institution raised ethical questions. Do you agree?
See all solutions

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