A range for a set of data is estimated to be 36 a. What is the planning value for the population standard deviation? b. At 95% confidence interval, how large a sample would provide a margin error of...

A range for a set of data is estimated to be 36

a. What is the planning value for the population standard deviation?

b. At 95% confidence interval, how large a sample would provide a margin error of 3?(nearest whole number)

c. At 95% confidence interval, how large a sample would provide a margin error of 2?(nearest whole number)