Cerebral blood flow (CBF) in the brains of healthy people is normally distributed with a mean of73. A random sample of 25 stroke patients resulted in an average CBF ofx=69.5

with a standard deviation ofs=15.

Test the hypothesis that the average CBF for stroke patients is different from that of healthy people using= 0.05.

(a) State the test statistic. (Round your answer to three decimal places.)

t=_______

(b) State the rejection region. (If the test is one-tailed, enter NONE for the unused region. Round your answers to three decimal places.)

t> _______

t< _______