a. Write down descriptive statistics and what are inferential statistics? Write down the similarities between descriptive and inferential statistics? Write down the differences?

b. Write down similarities between descriptive single-case designs (that are qualitative studies, like case studies are) and small-N research designs? Write down the differences? When must descriptive single-case designs be used and when must small-N research designs be used?

c. What are true experiments? How are threats to internal validity controlled by true experiments?

d. What do you mean by quasi-experimental designs? Why are they sigificant? How are they different from experimental designs?