In a defined target population, there are 1,950 small firms, 45 medium sized firms, and 5 large firms. A researcher is interested in drawing a probability sample from this population. However, given the greater economic significance of the five large firms, he wants to draw more heavily from that group. Given this objective, the researcher should use:
A)simple random sampling.
B)systematic random sampling.
C)disproportionately stratified sampling.
D)cluster sampling.
E)proportionately stratified sampling.

Question

Quizplus · Accepted Answer

Disproportionately stratified sampling allows the researcher to allocate different sampling fractions to different strata based on their importance. In this case, the larger firms are more economically significant, so the researcher wants to draw more heavily from that group. By using disproportionately stratified sampling, the researcher can allocate a larger sampling fraction to the stratum of large firms and therefore increase the likelihood of selecting more large firms in the sample. This method ensures that the sample is representative of the population while also taking into account the differences in importance between the strata.

In a Defined Target Population, There Are 1,950 Small Firms