An interval estimate for a mean is more informative than a point estimate, because with an interval estimate you can figure out the point estimate, but with the point estimate alone you have no idea about the width of the interval estimate.

(a) Explain why this statement is correct, illustrating using the reported 95% confidence interval of (4.0, 5.6)

for the mean number of dates in the previous month for women at a particular college.

(b) The confidence interval in

(a) used a sample size of 50.
What were the sample mean and standard deviation?