Chapter 12.5, Problem 13P

Determine whether the sampling method is random, systematic, or stratified. Tell whether the method will produce a good sample.

A bottle manufacturer checks the quality of every third bottle it makes.

To determine

Determine whether the sampling method is random , systematic or stratified . Tell whether the method will produce a good sample.

Answer to Problem 13P

Systematic

Explanation of Solution

Given:

A bottle manufacturer checks the quality of every third bottle it makes.

Calculation:

Since the manufacturer labels the bottles as 1,2,3 ; 1,2,3 ; 1,2,3 ; ... and uses all bottles numbered 3 to check the quality . So, the sampling method is systematic.

The best method would be random sampling . But since here also he is labeling the bottles randomly , it will produce good sample.