Suppose a population consisted of 300 patients How big the s

Suppose a population consisted of 300 patients. How big the sample size should be to have a maximum sampling error of 10%, if population is normally distributed?

A. 30 patients

B. 270 patients

C. 90 patients

D. Can\'t be determined.

I need an answer along with an explanation of how to find the solution.

Thank you!

Solution

you need to use this formula

error = Z * sigma / srqt (n)

but you we dont have sigma

and we dont nothing about alpha

with alpha we can calculate Z

so

D. Can\'t be determined.