To determine customer satisfaction with their service department, an automobile dealer randomly selects 20 hybrid-vehicle owners, 20 SUV owners, and 20 sedan owners and sends them a survey.

What type of sampling is used?

cluster

convenience
simple random

stratified

systematic

Amajor grocery store chain is trying to cut down on waste. currently, they get peaches from two different distributors, whole fruits and green grocer. out of a two large shipments, the manager randomly selects items from both suppliers and counts the number of items that are not sell-able due to bruising, disease or other problems. she then makes a confidence interval. is there a significant difference in the quality of the peaches between the two distributors? 95% ci for pw-pg: (0.064, 0.156)