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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The null hypothesis is that the standard deviation of the weights of one-year-old girls is 7 pounds. The alternative hypothesis is that the standard deviation is greater than 7 pounds. Show more…
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