Question

2. (Chapter 14) A manufacturer wanted to get opinions from 4,000 hardware store managers on a new type of lawn mower. An associate provided a list of such stores, divided into 400 large and 3,600 small stores. He drew a random sample of 200 stores and was disappointed to find only 19 large stores in the sample, since they represented more than 30 percent of the potential volume. Which probability sampling technique would you recommend to address this issue? Explain.

Answer 1

We can use stratified sampling

here we will divide it two strate 1) large store and 2) small store

and then we will sample from each one of them.

We can pick sample sizes in in ratio we want