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 greater than 6 pounds. Do the data provide convincing evidence that the pediatrician's claim is true? Use the a=0.01 level of significance.

1. State the null and alternate hypotheses.
2. Choose a significance level and find the critical value.
3. Compute the test statistic.
4. Determine whether to reject H0
5. State a conclusion.