Question

Suppose that you want to take a sample of size 8 from the 236 shells that...

Suppose that you want to take a sample of size 8 from the 236 shells that you found at the beach during Spring Break. Assume that there are equal amounts of conch, nautilus, puka, and cowry shells. If you were to divide the shells by type, then choose an SRS of two shells from each group, which type of sampling design would you be using?

Stratified Random Sampling

Convenience Sampling

Multistage Sampling

Math   Statistics-And-Probability   
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Answer #1

Answer : Stratified Random Sampling

In stratified random sampling, population with heterogeneous data is divided into separate groups, called strata such that Items in each group are homogeneous . Then, a simple random sample  is drawn from each group.

For the given problem,

The population contains 4 types of shells , therefore the each type of shell is considered as a strata (group) and a simple random sample of two shells each taken from each group (strata).

Hence the type of sampling design used is Stratified Random Sampling

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