24. Six-Month Growth Spurt A pediatrician randomly selected 50 six-month-old boys from her practice’s database and recorded an average weight of 8.0 kilograms with a standard deviation of 0.30 kilogram. She also recorded an average length of 67.3 centimeters with a standard deviation of 0.64 centimeter.

a. Find a 95% confidence interval for the average weight of all six-month-old boys.

b. Find a 99% confidence interval for the average length of all six-month-old boys.

c. What do you have to assume about the pediatrician’s database in order to make inferences about all sixmonth-

old boys?