In a simple random sample of 144 households in a county in V

In a simple random sample of 144 households in a county in Virginia, the average number of children in these households was 3.62 children. The standard deviation from this sample was 2.40 children. A 90% confidence interval for the mean number of children in all households would have a margin of error that is equal to what? Choose the closest answer from those given below. a) 2.40 b) 0.392 c) 0.328 d) 0.2

Solution

90% ci (3.289, 3.951)

margin of error is

c)

0.328