1) There is also an ordinal variable with 3 options - mild moderate severe, measured Pre and Post. Which is the appropriate test to compare pre and post between ordinal data with 3 options?
Ans:
The study variable contains ordinal data containing 3 categories. A pairwise comparison should be made on this variable. To compare pairwise ordinal data, wilcoxon sign test is used.
2) Select the best statistical analysis technique: You want to study regional differences (IV) in household savings (DV measured in dollars.) You randomly select samples of households in the West, South, and East.
3) You run a chi-square test. The critical value for this test at the .05 level is a chi-square of 6.21. What value must your obtained chi square statistic be in order to be considered significant at the .05 level?
4) If you have simple regression output with one independent variable and the R Square is .9332, what does the R Square indicate?
5) A researcher wants to collect data about the study habits of sophomores at Harmond University. From the sophomore class of 2,300 students, she wants to collect a sample of 70 students. Which of the following sampling methods will yield the most representative sample?
a. Assigning each sophomore a number and then randomly generating 70 numbers from that list.
b. Randomly selecting 70 sophomores entering the university's main library on a randomly selected evening.
c. Selecting the 70 sophomores whose grade point averages (GPA) fall closest to the mean GPA of the sophomore class.
d. Randomly selecting 70 sophomores who are members of college fraternities.
Read this book. It is interesting.
http://groups.google.com/group/statistical-experts/web/Sample_HBStatistic.pdf
