If Z is a standard normal random variable, then P(1.25 <= Z <= 0.75) is:
a. 0.6678
b. 0.1056
c. 0.2266
d. 0.1210
e. 0.3482
Question 2
In estimating the difference between two population means, if a 90 confidence interval includes zero, then we can be 90 certain that the difference between the two population means is zero.
Indicate whether the statement is true or false
