Assume that a sample is used to estimate a population proportion

. Find the margin of error M.E. that corresponds to a sample of size 77 with a mean of 30.7 and a standard deviation of 17.7 at a confidence level of 95%.

Report ME accurate to one decimal place because the sample statistics are presented with this accuracy.

M.E. =

Answer should be obtained without any preliminary rounding. However, the critical value may be rounded to 3 decimal places.