Assume that a personality trait is normally distributed in the general population, with a mean of 20 and a standard deviation of 5 Using the formula for M, what will GM be when a The research sample size is 49, b The research sample size is 64, and c The research sample size is 81 ...

Assume that a personality trait is normally distributed in the general population, with a mean of 20

Question:

Assume that a personality trait is normally distributed in the general population, with a mean of 20 and a standard deviation of 5. Using the formula for σM, what will GM be when
a. The research sample size is 49,
b. The research sample size is 64, and
c. The research sample size is 81?