question 15

Find the necessary sample size. 15) The rnenthl)r earnings of a gram]: of business students are are normally distributed with a standard 15} deviation of 589 dollars. A researcher wants to estimate the mean monthly earnings of all business students. Find the sample size needed to have a confidence level of 95% and a margin of error of 132 dollars. A) 67 B] 4 C) 2 U) 77