1. Intro to Stats and Collecting Data

A quality control manager wants to see how many defective products come off the line on average per day. They take 10 random units produced over the course of the day from each of 10 machines to test if they are defective. What type of sampling method is this?

A(n) _______ sample is obtained by dividing the population into groups and selecting all individuals from within a random sample of the groups.