For several years researchers have noticed that there appears to be a regular, year-by-year increase in the
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a. Based on the sample, is the average IQ for today's population significantly different from the average 10 years ago, when the test would have produced a mean of µ = 100? Use a two-tailed test with a = .01.
b. Make an 80% confidence interval estimate of today's population mean IQ for the 10-year-old test.
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Related Book For
Essentials Of Statistics For The Behavioral Sciences
ISBN: 9781133956570
8th Edition
Authors: Frederick J Gravetter, Larry B. Wallnau
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