Math STATS 218
posted by Brittany .
When the following hypotheses are being tested at a level of significance of
aH0: m 100
Ha: m < 100
the null hypothesis will be rejected if the test statistic Z is
a. >Z
b. >Z
c. <Z
d. <100

You are lacking information on variability and level of significance used (e.g., P ≤ .05, P ≤ .01).
It would also help if you proofread your questions before you posted them. Choices a and b are identical.