A simple random sample of 38

38 men from a normally distributed population results in a standard deviation of 10.4

10.4 beats per minute. The normal range of pulse rates of adults is typically given as 60 to 100 beats per minute. If the range rule of thumb is applied to that normalrange, the result is a standard deviation of 10

10 beats per minute. Use the sample results with a 0.05

0.05 significance level to test the claim that pulse rates of men have a standard deviation equal to 10

10 beats per minute. Complete parts(a) through(d) below.

a. Identify the null and alternative hypotheses. Choose the correct answer below.

A.

Upper H 0 : sigma equals 10

H0:=10 beats per minute

Upper H 1 : sigma less than 10

H1:<10 beats per minute

B.

Upper H 0 : sigma not equals 10

H0:10 beats per minute

Upper H 1 : sigma equals 10

H1:=10 beats per minute

C.

Upper H 0 : sigma greater than or equals 10

H0:10 beats per minute

Upper H 1 : sigma less than 10

H1:<10 beats per minute

D.

Upper H 0 : sigma equals 10

H0:=10 beats per minute

Upper H 1 : sigma not equals 10

H1:10 beats per minute

Your answer is correct.

b. Compute the test statistic.

chi squared

2equals =

(Round to three decimal places asneeded.)