Statistics, Books a la Carte Edition (13th Edition)
13th Edition
ISBN: 9780134090412
Author: Sincich, Terry T, MCCLAVE, James T.
Publisher: PEARSON
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Chapter 9.3, Problem 9.43ACB
To determine
To find: The ranks of the mean performance score.
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A researcher conducted a repeated measures study comparing three treatment conditions. Refer to attached images and tale to answer a to d.
Mean
Std. Deviation
N
Treatment I
1.00
1.414
5
Treatment II
5.00
2.345
5
Treatment III
6.00
1.581
5
In APA format, report the F-ratio related to the treatment effect:
Is this treatment effect significant?
What is the partial η2 value for the treatment effect?
Is this a weak, moderate, or strong effect?
Independent random samples of 32 people living on the west side of a city and 30 people living on the east side of a city were taken to determine if the income levels of west side residents are significantly different from the income levels of east side residents. Given the testing statistics below, determine if the data provides sufficient evidence to conclude that the income levels of west side residents are significantly different from the income levels of east side residents, at the 2% significance level.
H0:μw=μeHa:μw≠μe
t0=2.364
t0.01=±2.099
Select the correct answer below:
No; the test statistic is not between the critical values.
No; the test statistic is between the critical values.
Yes; the test statistic is not between the critical values.
Yes; the test statistic is between the critical values.
In a study examining the effect of alcohol on reaction
time, Liguori and Robinson (2001) found that even
moderate alcohol consumption significantly slowed
response time to an emergency situation in a driving
simulation. In a similar study, researchers measured
reaction time 30 minutes after participants consumed
one 6-ounce glass of wine. Again, they used a stan
dardized driving simulation task for which the regular
population averages μ = 400 msec. The distribution of
reaction times is approximately normal with σ = 40.
Assume that the researcher obtained a sample mean of
M = 422 for the n = 25 participants in the study.
a. Are the data sufficient to conclude that the alcohol
has a significant effect on reaction time? Use a
two-tailed test with α = .01.
b. Do the data provide evidence that the alcohol
significantly increased (slowed) reaction time? Use
a one-tailed test with α = .01.
c. Compute Cohen’s d to estimate the size of the
effect.
Chapter 9 Solutions
Statistics, Books a la Carte Edition (13th Edition)
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