Chapter 12, Problem 20CR

To determine

Find if the sampling method is random, systematic, or stratified.

Answer to Problem 20CR

  $systematic$

Explanation of Solution

Given information:

Given: An interviewer outside a movie theater asks every third person standing in a line if he or she will see more or fewer movies in the coming years.

Calculation:

Here, the objective is to determine the sampling method and then write the unbiased survey question.

Now, in the systematic sampling method select any number $k$ at random, and survey every $k^{th}$ person in the sample.

Now, put $value3fork$ then survey on every third.

Hence, the sampling method is $systematic$ .