Statistics for The Behavioral Sciences (MindTap Course List)
10th Edition
ISBN: 9781305504912
Author: Frederick J Gravetter, Larry B. Wallnau
Publisher: Cengage Learning
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Chapter 9, Problem 15P
Standardized measures seem to indicate that the average level of anxiety has increased gradually over the past 50 years (Twenge, 2000). In the 1950s, the average score on the Child Manifest Anxiety Scale was
a. Based on the sample, has there been a significant change in the average level of anxiety since the 1950s? Use a two-tailed test with
b. Make a 90% confidence
c. Write a sentence that demonstrates bow the outcome of the hypothesis test and the confidence interval would appear in a research report.
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Chapter 9 Solutions
Statistics for The Behavioral Sciences (MindTap Course List)
Ch. 9 - Under what circumstances is a t statistic used...Ch. 9 - A sample of n=16 scores has a mean of M=56and a...Ch. 9 - Find the estimated standard error for the sample...Ch. 9 - Explain why tdistributions tend to be flatter and...Ch. 9 - Find the t values that form the boundaries of the...Ch. 9 - Find the t value that forms the boundary of the...Ch. 9 - The following sample of n=4 scores was obtained...Ch. 9 - The following sample was obtained from a...Ch. 9 - A random sample of n=12 individuals is selected...Ch. 9 - A random sample of n=25 individuals is selected...
Ch. 9 - To evaluate the effect of a treatment, a sample is...Ch. 9 - To evaluate the effect of a treatment, a sample of...Ch. 9 - The spotlight effect refers to overestimating the...Ch. 9 - ]14. Many animals, including humans, tend to avoid...Ch. 9 - Standardized measures seem to indicate that the...Ch. 9 - Weinstein, McDermott, and Roediger (2010) report...Ch. 9 - Ackerman and Goldsmith (2011) found that students...Ch. 9 - A random sample of n=16 scores is obtained from a...Ch. 9 - A random sample is obtained from a population with...Ch. 9 - An example of the vertical-horizontal illusion is...Ch. 9 - In the Preview for this Chapter, we discussed a...Ch. 9 - Oishi and Schimmk (2010) report that people who...Ch. 9 - Research examining the effects of preschool...
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