Has the researcher made a type

1. Explain the
pros and cons of longitudinal, cross-sectional, and sequential designs.

2. Has the researcher made a type 1
or a type 2 error or arrived at the correct decision in each of the following
examples? Why?

1. He
   rejects the null hypothesis even though in reality the independent
   variable has no effect. Type 1 error
2. He
   rejects the null hypothesis when it is in fact false. Type 1 error
3. He
   does not reject the null hypothesis although in reality the independent
   variable does have an effect. Type 2 error

3. Discuss one-way analysis of
variance functions. How is between- and within-group variability used?

4. A researcher decides to test her
hypothesis that some toys are more fun to play with than others, so she decides
to compare fun toys or blocks with “un-fun” toys or stuffed animals. She is
also interested in seeing whether a gender difference exists, so she adds
gender as an independent variable.

1. What
   type of research design is required? Experimental Study Design
2. Diagram
   it.
3. If 20
   subjects are required per cell, how many subjects are required overall for
   this study?