Test hypothesis that population trimmed mean is exactly 4.8

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A standard measure of aggression in 7-year-old children has been found to have a 20% trimmed mean of 4.8 based on years of experience.

A psychologist wants to know whether the trimmed mean for children with divorced parents differs from 4.8. Suppose X‾_t = 5.1 with s_w = 7 based on n = 25. Test the hypothesis that the population trimmed mean is exactly 4.8 with α = .01.

Reference no: EM131398729

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