Question

identify which of these types of sampling is used: random, systematic, convenience, stratified, or cluster. to determine her water pressure, denise divides up her day into three parts: morning, afternoon, and evening. she then measures her water pressure at 2 randomly selected times during each part of the day. what type of sampling is used? options: systematic, convenience, cluster, random, stratified

Explanation:

1. Recall the definitions of each sampling type:

• Stratified Sampling: The population is divided into subgroups (strata) that are homogeneous, and then samples are taken from each stratum.
• Random Sampling: Samples are chosen entirely by chance from the entire population.
• Cluster Sampling: The population is divided into clusters, and then entire clusters are selected.
• Convenience Sampling: Samples are taken from the most convenient part of the population.
• Systematic Sampling: Samples are taken at regular intervals from the population.

1. Analyze Denise's method: She divides her day into three parts (morning, afternoon, evening - these are strata as they represent different time periods of the day) and then takes 2 random samples from each stratum. This matches the definition of stratified sampling as she is sampling from each subgroup (stratum) after dividing the population (her day) into homogeneous subgroups.

Answer:

Stratified (the option corresponding to "Stratified" among the given choices)