Question

Assume that the distribution of total garbage discarded per household for the entire population of the state of Arizona is normal with standard deviation σ = 12.5 pounds.

Assume that the data of the total garbage provided in garbage.xls was collected from an SRS of the Arizona population.
Calculate the 97% confidence interval for the mean of total garbage discarded by the entire population of Arizona.
You need to determine the mean of total garbage discarded by the entire population of Arizona with 98% confidence and margin of error of not more than ±2 pounds.