How many tissues should a package of tissuescontain? Researchers have determined that a person uses an average of 61 tissues during a cold. Suppose a random sample of 10,000 people yielded the following data on the number of tissues used during acold: x=51, s=16. We want to test the alternative hypothesis Ha: <61. State the correct rejection region for =0.05.

A.

Reject H0 if z<1.96.

B.

Reject H0 if z> 1.96 or z<1.96.

C.

Reject H0 if z> 1.645.

D.

Reject H0 if z<1.645.