In a Simple Random Sample of 144 Households in a City

Multiple Choice

In a simple random sample of 144 households in a city in Kentucky, the average number of children in these households was 1.12 children. The standard deviation from this sample was 2.40 children. A 90 percent confidence interval for the mean number of children in all households in this city is:

A) 2.40 ± 0.2.
B) 1.12 ± 0.2.
C) 1.12 ± 2.40.
D) 1.12 ± 0.328.
E) It is impossible to tell without a census.