question 1 X=78, S=23, and n=16, and assuming that the
population is normally distributed, construct a 90% confidence
interval estimate of the population mean, μ.
≤μ≤
Question 2 If n=400 and X=160, construct a 90% confidence
interval estimate for the population proportion.
≤π≤
Question 3 If you want to be 95% confident of estimating the
population mean to within a sampling error of ±4 and the standard
deviation is assumed to be 16, what sample size is required?
Question 4 If you want to be 99% confident of estimating the
population proportion to within a sampling error of ±0.05 and there
is historical evidence that the population proportion is
approximately 0.45, what sample size is needed?
Question 5 In a study of 427 nonprofits nationwide, 84
indicated that turnover has been the biggest employment challenge
at their organization. a. Construct a 95% confidence interval
for the population proportion of nonprofits that indicate turnover
as the biggest employment challenge at their organization.