A) SEm = SD/√n
B) 95% = mean ± 1.96 SEm
C) Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability (.005) and its Z score. Substitute that for the 1.96 in B equation.
To determine the views of a students on a particular campus about fraternities, an 11-point attitude scale was administered to a random sample of 40 students. This survey yielded a sample mean of 6 (the higher the score, the more favorable the view of the fraternities) and a standard deviation of 1.5
A) Estimate the standard error of the mean
B) Find the 95% confidence interval for the population mean
C)Find the 99% confidence interval for the population mean
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