Standardized measures seem to indicate that the average level of anxiety has increased gradually over the past

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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 μ = 15.1. A researcher administers the same test to a sample of n = 50 of today's children to determine whether there has been a significant change in the average anxiety level.
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Statistics For The Behavioral Sciences

ISBN: 9781111830991

9th Edition

Authors: Frederick J Gravetter, Larry B. Wallnau

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