In a One-Sample Z Test,when You Have Evidence or Reasoning

Multiple Choice

In a one-sample z test,when you have evidence or reasoning to suggest that your sample mean will most likely differ from the hypothesized population value in one direction (for example,"it will be higher than the hypothesized value") ,you would use a

A) nondirectional ("two-tailed") test
B) directional ("one-tailed") test
C) more stringent alpha level
D) both a and c