Q5 Select the TWO options that are TRUE statements about sur

Q5

Select the TWO options that are TRUE statements about survey sampling.

Select one or more:

A) In cluster sampling, each cluster must differ as far as possible from the other clusters with respect to the subject under investigation.

B) In stratified sampling, each member of the population should be allocated to a stratum at random.

C) In a stratified sample, the sizes of the subsamples from each stratum may differ from one another.

E) If a survey uses stratification, it must not use clustering as well.

F) Cluster sampling usually increases the sampling error compared to a simple random sample of the same size.

Solution

C) In a stratified sample, the sizes of the subsamples from each stratum may differ from one another.

Since size of each stratum may be different we set a proportion to collect subsamples from each stratum. Though proportion is same for all sub-samples its size may be different.

F) Cluster sampling usually increases the sampling error compared to a simple random sample of the same size.

For the same sample size more accuracy is observed in simple random sample as compared to cluster sample.

The two statements are ture.