The time needed for college students to complete a certain paper and pencil maze follows a normal distribution with a mean of 70 seconds and a standard deviation of 15 seconds. You wish to see if the mean timeis changed by meditation, so you have a group of nine college students meditate for 30 minutes and then complete the maze. It takes them an average ofx= 64 seconds to complete the maze. Use this information to test the hypotheses

H0:=70,Ha: 70

at significance level= 0.01. You conclude

a. thatH0should be rejected.

b. thatH0should not be rejected.

c. thatHashould be accepted.

d. this is a borderline case and no decision should be made.