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