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 7 pounds. Do the data provide convincing evidence that the pediatrician's claim is true? Use the =α0.05 level of significance.

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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

7

pounds. Do the data provide convincing evidence that the pediatrician's claim is true? Use the

=α0.05

level of significance.

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