R2. Part 3/5

Babies: A sample of 25 one-year-old girls had a mean weight of 24.1 pounds with a standard deviation of .4.3 pounds. Assume that the population of weights is normally distributed. A pediatrician claims that the standard deviation of the weights of one-year-old girls is less than 6 pounds. Do the data provide convincing evidence that the pediatrician's claim is true? Use the a = 0.01 level of significance.

Part 1/5 Answered

State the appropriate null and alternate hypotheses.

H0 : SD = 6

H1 : SD < 6

The hypothesis test is a left-tailed test.

Part 2/5

Find the critical value. Round the answer to three decimal places.

For a = 0.01, the critical value is

Critical value = 10.856

Part 3/5

Compute the test statistic. Round the answer to three decimal places.

X2 =