Question

In Exercises 9–20, identify which of these types of sampling is used: random, systematic, convenience, stratified, or cluster.

UFO Poll In a Kelton Research poll, 1114 Americans 18 years of age or older were called after their telephone numbers were randomly generated by a computer, and 36% of the respondents said that they believe in the existence of UFOs.

Short answer

Random sampling

Step-by-step solution

Given information

The responses were taken from 1114 Americans who were 18 or above in age. They were selected through randomly generated telephone numbers.

36% of those polled stated they believed in the existence of UFOs.

Step 2:Identify the method of sampling

Random sampling is a sample collection method that includes participants of the study who are gathered randomly, that is, without following any order.

In the sampling process, the selections were made using the randomly generated telephone numbers by a computer.

Thus, the process of generating the numbers is completely randomized, and hence the selections can also be considered to be collected by the process of simple random sampling.