Question

The population standard deviation for the height of college basketball players is 3 inches. If we want to estimate 99% confidence interval for the population mean height of these players with a 0.7 margin of error, how many randomly selected players must be surveyed?  (Round up your answer to nearest whole number)

Answer 1

Solution :

Given that,

  = 3

E = 0.7

At 99% confidence level the z is ,

  = 1 - 99% = 1 - 0.99 = 0.01

/ 2 = 0.01 / 2 = 0.005

Z_/2 = Z_0.005 = 2.576

sample size = n = (Z_/2* /E)2

n = (2.576 * 3 / 0.7)2

n= 122