Question

Please answer this question..

A marketing researcher wants to find a 95% confidence interval for the mean amount that visitors to a theme park spend per person per day. She knows that the standard deviation of the amounts spent per person per day by all visitors to this park is $11. How large a sample should the researcher select so that the estimate will be within $2 of the population mean? 2,

Answer 1

SD = 11

Margin of error = 2

z at 95% = 1.96

$2=1.96*\frac{11}{\sqrt{n}}$

n = 117