Estimating sample Size needs in a quantitative study

Which of the following is true when estimating sample size needs in a quantitative study? A small sample may be sufficient if the intervention effect size is large.

b. Samples of under 100 subjects are inadequate.

c. A power analysis is used to determine the sample size for a descriptive survey study.

d. The stronger the effect size of an intervention, the more subjects will be needed.

2. Which of the following classification of research designs are based on the dimension of control over independent variables?

a.Cross-sectional and longitudinal

b. Structured and flexible

c. Retrospective and prospective

d. Experimental and quasi-experimental

3. A type of study in which data are collected from the same people at two or more points in time:

a.Retrospective study

b. Longitudinal study

c. Case-control study

d. Prospective study