Question

Five different sampling methods are described below. Choose the one that defines stratified sampling. 1. Select...

Five different sampling methods are described below. Choose the one that defines stratified sampling.

1. Select members of a population by asking for volunteers, or otherwise find a sample that is easy to obtain and is not based on randomness or chance.

2. Order the population, select a random starting point and interval, then select individuals every interval from the starting point until the desired sample size is achieved.

3. Take a sample of size ?n from a population in such a way that every possible sample of size ?n has an equal probability of being chosen.

4. Divide a population into comparable groups, select a simple random sample of the groups, and then sample all of the individuals within each of the chosen groups.

5. Divide a population into groups based on similar characteristics, then take a random sample from each group.

The process for performing stratified sampling is as follows:

Step 1: Divide the population into smaller subgroups, or strata, based on the members’ shared attributes and characteristics.

Step 2: Take a random sample from each stratum in a number that is proportional to the size of the stratum.

Step 3: Pool the subsets of the strata together to form a random sample.

Option 4 is correct.

4. Divide a population into comparable groups, select a simple random sample of the groups, and then sample all of the individuals within each of the chosen groups.

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