A Hypothesis Test Is to Be Performed $8.4$ Minutes the Manager Has Installed a New Computer System and and Alternative

Multiple Choice

A hypothesis test is to be performed. State the null and alternative hypotheses.
-Last month the mean waiting time at a bank was $8.4$ minutes. The manager has installed a new computer system and claims that people will no longer have to wait as long.

A) Null hypothesis: mean waiting time $= 8.4$ minutes
Alternative hypothesis: mean waiting time $\leq 8.4$ minutes
B) Null hypothesis: mean waiting time $> 8.4$ minutes
Alternative hypothesis: mean waiting time $< 8.4$ minutes
C) Null hypothesis: mean waiting time $< 8.4$ minutes
Alternative hypothesis: mean waiting time $= 8.4$ minutes
D) Null hypothesis: mean waiting time $= 8.4$ minutes
Alternative hypothesis: mean waiting time $< 8.4$ minutes