For a one-tailed test where the predicted value of the sample mean is larger than the population mean and $\alpha$= 0.05, is always equal to
A)±1.645.
B)+1.645.
C)-1.645.
D)±1.96.

Question

For a one-tailed test where the predicted value of the sample mean is larger than the population mean and $\alpha$= 0.05,  is always equal to
A)±1.645. 
B)+1.645. 
C)-1.645. 
D)±1.96.

Quizplus · Accepted Answer

Since it is a one-tailed test and we know the predicted value of the sample mean is larger than the population mean, we are only interested in the right-tailed critical value. With alpha level of 0.05, F1F1F1S1F1F1F10 = 1.645. The answer is B, +1.645.

For a One-Tailed Test Where the Predicted Value of the Sample