Question: Weight gained, part 3. Consider the data from Exercise 31 on the weight gained (in kg) by 163 underweight individuals on the basis of their

Weight gained, part 3.

Consider the data from Exercise 31 on the weight gained (in kg) by 163 underweight individuals on the basis of their age after a month of following the prescribed diet plan. The mean age was 21 years old, and the standard deviation was 5.63.

a) Find a 90% confidence interval for the mean weight gained by all individuals of 19 years of age.

b) Find a 90% prediction interval for the weight gained by an adult, if you know the individual’s age to be 30 years.

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