Questions: Identify the sampling technique used for the following study. A random number generator is used to choose twenty-five zip codes. Then a political strategist collects data from each person in these zip codes.

Identify the sampling technique used for the following study. A random number generator is used to choose twenty-five zip codes. Then a political strategist collects data from each person in these zip codes.

Transcript text: Identify the sampling technique used for the following study. A random number generator is used to choose twenty-five zip codes. Then a political strategist collects data from each person in these zip codes.

Solution

Solution Steps

Step 1: Identify the Sampling Technique

Review the description of the study: A random number generator is used to choose twenty-five zip codes, and data is collected from each person in these zip codes.

Step 2: Analyze the Sampling Process

Recognize that the study involves selecting entire groups (zip codes) rather than individual elements from the population.
Note that data is collected from all individuals within the selected groups.

Step 3: Match the Description to a Sampling Technique

Compare the process to the definitions of the given sampling techniques:
- Census: Collecting data from every member of the entire population.
- Simple Random Sampling: Selecting individuals randomly from the entire population.
- Stratified Sampling: Dividing the population into strata and sampling from each stratum.
- Cluster Sampling: Dividing the population into clusters and sampling all individuals within randomly selected clusters.
- Systematic Sampling: Selecting every \( n \)-th individual from a list.
- Convenience Sampling: Selecting individuals based on ease of access.
Determine that the process described matches Cluster Sampling, as entire zip codes (clusters) are randomly selected, and data is collected from all individuals within those clusters.