You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe the population standa

[answerhappygod]

You want to obtain a sample to estimate a population mean. Based
on previous evidence, you believe the population standard deviation
is approximately σ = 23.1 . You would like to be 95% confident that
your estimate is within 2.5 of the true population mean. How large
of a sample size is required? n = Do not round
mid-calculation. However, you are encouraged to use a critical
value accurate to three decimal places — this is important for the
system to be able to give hints for incorrect
answers.