Chapter 6, Problem 6.5P

SOC

A researcher has gathered information from a random sample of 178 households. For each of the following variables, construct confidence intervals to estimate the population mean. Use the 90% level.

a. An average of $2.3$ people resides in each household. Standard deviation is $0.35$.

b. There was an average of $2.1$ television sets $\left(s=0.10\right)$ and $0.78$ telephones $\left(s=0.55\right)$ per household.

c. The households averaged $6.0$ hours of television viewing per day $\left(s=3.0\right)$.