Suppose that the IQ scores of a large group of children can be considered to be normally distributed. A sample of 25 such children yielded a sample IQ of 114.2 and a sample standard deviation of 12.1....

Suppose that the IQ scores of a large group of children can be

considered to be normally distributed. A sample of 25 such

children yielded a sample IQ of 114.2 and a sample standard deviation of 12.1.

(a) Find 95 and 99% confidence intervals for the true average

IQ of children in this group.

(b) Is it reasonable to suppose that the true average IQ of this

group of children is 100?