1. A sociologist wants to examine academic performance across grade levels in an

Question

1. A sociologist wants to examine academic performance across grade levels in an elementary school. The number of students is not the same in each grade. Which sampling method would be most appropriate?

Select one: a. simple random sampling b. systematic random sampling c. stratified random sampling

2. A researcher asks children to complete a math test. Half of the children are told they will be rewarded for every correct answer; the others will receive no reward. The researcher will compare the mean test scores for the two groups. What type of research design is this?

Select one: a. Census b. Experiment d. Survey

To increase the generalizability of a study's results, participants must be

Select one: a. approximately the same age. b. blinded to the purpose of the research. d. representative of the population of interest.

Explanation / Answer

1) Since the sociologist wants to examine performance across grade levels, where the number of students are not equal (that is population is divided into sub levels), then the sampling method to be used is c. stratified random sampling.

2) A census is the count of the population. A survey is what a set of population thinks. Hence what the researcher is doing is conducting an experiment. The answer is b. experiment.

3) To increase the generalizability of a study's results, participants must be d. representative of the population of interest.

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