Asked Dec 26, 2019

In Exercise identify which of these types of sampling is used: random, systematic, convenience, stratified, or cluster.

Highway Strength The New York State Department of Transportation evaluated the quality of the New York State Throughway by testing core samples collected at regular intervals of one mile.


Expert Answer

Step 1

Random sampling:

It is a type of sampling where all the subjects to be included in the sample were given an equal chance of being selected. If there are n subjects, then each subject would have a chance of 1/n for being selected in the sample.

Systematic sampling:

In this type of sampling a random number k is selected and sample units are taken at regular intervals from k. Suppose k is 3, the first sample unit is the 3rd subject, 2nd sample unit is the 6th subject and so on.

Convenience sampling:

In this sampling method the subjects are selected as per the researcher’s convenience. For example, a researcher may select the first 20 customers leaving a supermarket for his survey.

Stratified sampling:

This type of sampling is used when the population to be sampled is heterogeneous, the heterogeneou...

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