In Exercises 9–20, identify which of these types of sampling i...

Question

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

Criminology Researchers randomly selected 50 convicted felons from each category of burglary, auto theft, and assault.

Accepted Answer

All right, hello, everyone. So this question is asking us to identify the type of sampling method used. Random, systematic, convenience, stratified, or clustered. To study student academic performance, researchers divided a high school into 4 grade levels, that is 9th, 10th, 11th, and 12th, and randomly selected 50 students from each grade to analyze their test scores. Now here we also have 5 different multiple choice options labeled A through E, with each one being a type of sampling method discussed in the beginning of the question step. So first, let's talk about the different types of sampling, right? Starting off with a random sampling, that's option A. Which, if you recall, means that all members of the population have an equal chance of being selected for the survey. On the other hand, for option B, we have systematic sampling. Which involves choosing members of the population to be included in the study. Using regular intervals. So for example, selecting every nth subject is an example of systematic sampling. Option C, however, is convenient sampling. Now, the main thing to remember about convenience sampling is that it is ease of access that matters the most. So here, in convenience sampling, subjects are selected based on who is easiest to reach without randomizing. And before we go on to option D, let me just go ahead and fix the fact that I misspelled access. There we go. Alright, so now, for option D, we have stratified sampling. Now stratified sampling can. Easily be confused with cluster sampling, that's option E. So I want to take a second to talk about both at the same time. Because what stratified and cluster sampling have in common is that both of these involve divided the population into subgroups first. Now, in stratified sampling, the subgroups are called strata. And in cluster sampling, the subgroups are called clusters. But what happens to the subgroups after they're made is what distinguishes the two. So in stratified sampling. Once the strata have been made from the greater population, once the subgroups have been divided, random samples. Are taken From each group. So people are randomly selected. From within each strata to be included in the survey or in the study in general. Now, on the other hand, In cluster sampling, once the subgroups have been made, then entire clusters. are selected randomly for sampling. So now let's go back to the scenario that we were given. The first thing that happens is that the researchers divided the high school into 4 grade levels or divided the students by grade level. So here, subgroups were made from the greater population. Which means that it can either be stratified or cluster sampling. But once again, the difference is what happens after the subgroups have been made. And after the the students were divided by grade level. Students were randomly selected from each grade level to be included in the survey. So, random samples were taken from each subgroup, from each strata, in this case. So therefore, The study in question used stratified sampling. Which means that option D is correct. If this were cluster sampling, for example. Instead, what would have happened is that. Entire grade levels would have been selected instead, not students from each grade level. And so with that being said, thank you so very much for watching, and I hope you found helpful.

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In Exercises 9–20, identify which of these types of sampling is used: random, systematic, convenience, stratified, or cluster.
Criminology Researchers randomly selected 50 convicted felons from each category of burglary, auto theft, and assault.

Key Concepts

Stratified Sampling

Random Sampling

Population and Sample

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In Exercises 9–20, identify which of these types of sampling is used: random, systematic, convenience, stratified, or cluster.Criminology Researchers randomly selected 50 convicted felons from each category of burglary, auto theft, and assault.