INFERETIAL STATS FORMULAS

Question 1

Standard Score/ Standard Normal Dist.

Answer 1

z= value - mean/ standard deviation

Question 2

Formula for the minimum sample size needed for an interval estimate of population mean

Answer 2

n= ((za/2 • ó)/E)^2

Question 3

Z-test

Answer 3

z= sample mean - hypothesized population mean/ (population standard deviation/ square root of sample size)

Question 4

T test for a mean

Answer 4

t= Sample Mean-hypothesized population mean/ (sample standard deviation/ square root of n