Chapter 12, Problem 13E

To determine

To identify for the following reports about the statistical studies, the population, the population parameter of interest, the sampling frame, the sample, the sampling method including whether or not randomized was employed and any potential sources of bias you can detect and any problems you see in generalizing to the population of interest.

Explanation of Solution

It is given in the question that a company packaging snack foods maintains quality control by randomly selecting ten cases from each day’s production and weighing the bags. Then they open one bag from each case and inspect the contents Thus, from this report we can identify that:

The population will be: Snack food bags.

The population parameter of interest will be: Weight of bags, proportion passing inspection.

The sampling frame will be: All bags produced each day.

The sample is: Bags in ten randomly selected cases, one bag from each case for inspection.

The sampling method including whether or not randomized was employed is: It is Multistage sampling.

Any potential sources of bias you can detect and any problems you see in generalizing to the population of interest: Is bag from each case randomly selected as well?