Statistics for Business and Economics (13th Edition)
13th Edition
ISBN: 9780134506593
Author: James T. McClave, P. George Benson, Terry Sincich
Publisher: PEARSON
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Chapter 9.2, Problem 9.22ACB
(a)
To determine
To identify: The experimental design.
(b)
To determine
To identify: The dependent variable.
(c)
To determine
To find: The factor and the factor levels.
(d)
To determine
To find: The hypothesis.
(e)
To determine
To interpret: The results.
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Does being part of a support group affect the ability of people to quit smoking? A county health department enrolled 300 smokers in a randomized experiment. 150 participants were assigned to a group that used a nicotine patch and met weekly with a support group; the other 150 received the patch and did not meet with a support group. At the end of the study, 40 of the participants in the patch plus support group had quit smoking while only 30 smokers had quit in the other group.
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a support group. At the end of the study, 40 of the participants in the patch plus support group had quit
smoking while only 30 smokers had quit in the other group.
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Kava is a beverage or extract that is made from Piper methysticum, a plant native to the western Pacific islands. Suppose that,
in a randomized comparative experiment to determine if taking kava daily can reduce insomnia, a group of participants with
insomnia were randomly assigned to take kava (treatment group) or a placebo (control group). After six weeks, the
participants were interviewed to see if they experienced a decrease in insomnia. The table shows the results from the sample.
The counts are the number of people in each group who experienced a decrease in insomnia.
Group
Description
Population
proportion
Sample size Sample count
Sample proportion
1
Treatment (kava)
P1
n₁ = 402
x1 = 213
P₁ = 0.5299
2 Control (placebo)
P2
n₂ = 521
x₂ = 121
P2 = 0.2322
Compute the standard error estimate, SE, of the difference in the sample proportions. Give your answer to at least four
decimal places.
0.0438
SE =
Incorrect
Determine the value of the two-sample z-statistic for the difference in…
Chapter 9 Solutions
Statistics for Business and Economics (13th Edition)
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