Question on Chapter 7: The Logic of Sampling – Probability sampling

Which one of the following definitions refers to PPS (a type of probability sampling)?

1. A type of sampling in which the units composing a population are assigned numbers. A set of random numbers is then generated, and the units having those numbers are included in the sample.
2. A type of sampling in which every kth unit in a list is selected for inclusion in the sample.
3. A type of sampling in which each member of population has the same chance of being selected into the sample.
4. A type of multistage cluster sample in which clusters are selected, not with equal properties but with probabilities proportionate to their sizes – as measured by the number of units to be subsampled.
5. None of the above.

Answer: D

PPS: Probability Proportionate to Size is a type of multistage cluster sample in which clusters are selected, not with equal properties but with probabilities proportionate to their sizes – as measured by the number of units to be subsampled.

EPSEM: A type of multistage cluster sample in which clusters are selected, not with equal properties but with probabilities proportionate to their sizes – as measured by the number of units to be subsampled.

Systematic sampling: A type of sampling in which every kth unit in a list is selected for inclusion in the sample.

Simple random sampling: A type of sampling in which the units composing a population are assigned numbers. A set of random numbers is then generated, and the units having those numbers are included in the sample.