Answer:
Confidence interval for the mean consumption of milk per week among males over age 25 in 85% confidence level is (2.8≤μ≤3.0)
Step-by-step explanation:
Consumption of milk among males over age 25 can be found using the formula:
M±[tex]z*\frac{s}{\sqrt{N} }[/tex]  where M is the sample mean, z is the corresponding z-score for 85% confidence level, s is the population standard deviation, N is the sample size.
In this sample, mean of milk consumption per week among males over age 25 is 2.9 liters. Corresponding z-score for 85% confidence interval is 1.440. standard deviation of the sample is 1.1. And sample size is 513. When we put these numbers in the formula, we got:
2.9±[tex]1.440*\frac{1.1}{\sqrt{513} }[/tex] =2.9±0.07
