Estimate true proportion of blue-eyed community
Find out the sample size that is required to estimate the true proportion of blue-eyed community college students if you want your estimate to be within 0.02 with 90% confidence.
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What occurs to the standard error of the estimate as the correlation moves closer to zero? Why?
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In a study of physical attractiveveness and mental disorders, 231 subjects were rated for attractiveness, and the resulting sample mean and standard deviation are 3.94 and 0.75, respectively.Construct the 95% confidence interval for the population
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