Consider an infinite population with a mean of 160 and a standard deviation of 25 . A random sample of size 64 is taken from this population. The standard deviation of the sample mean equals:
a. 25 c. 25/64
b. 25/64 d. None of these choices.
Question 2
The probability distribution of the error variable is normal, with mean E() = 0, and standard deviation =1.
Indicate whether the statement is true or false
