Calculate the critical values for testing the population standard deviation.
A doctor believes that the standard deviation of systolic blood pressure is 450. A random sample of 24 patients found a standard deviation of 520. Suppose the variable is normally distributed and a = 0.01. What are the critical values?
A.10.196 and 41.638
b.9.886 and 45.559
c.9.262 and 44.181
d.10.856 and 42.980