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Chapter 10: Q. 9 (page 666)

How much more effective is exercise and drug treatment than drug treatment alone at reducing the rate of heart attacks among men aged 65and older? To find out, researchers perform a completely randomized experiment involving 1000healthy males in this age group. Half of the subjects are assigned to receive drug treatment only, while the other half are assigned to exercise regularly and to receive drug treatment. The most appropriate inference method for answering the original research question is

(a) one-sample z test for a proportion.

(b) two-sample z interval forp1-p2

(c) two-sample z test for p1-p2.

(d) two-sample t interval for 渭1-渭2.

(e) two-sample t-test for 渭1-渭2.

Short Answer

Expert verified

The most appropriate inference method for answering the original research question is option (b) two-sample z interval forp1-p2.

Step by step solution

01

Given information

Rate of heart attack among men is 65

Healthy males is 1000

02

Explanation

One proportion: one-sample z test/interval

Two proportions: two-sample z test/interval

One mean: one-sample t-test Two means: two-sample t-test/interval or paired t-test/interval/interval

Use a test if you want to test for a difference, equality, increase or decrease. Use an interval if you want to estimate an interval in which the true value lies.

Two-sample z interval for a proportion differencep1-p2.

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