Weight gained, part 3. Consider the data from Exercise 31 on the weight gained (in kg) by

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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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