2. Provide clear definitions for simple effect, main effect, and 2-way interaction.
3. What is the critical F value (a = .05) for an experiment with 4 levels of the independent variable and 10 participants per level? If the obtained F were 4.00, would you reject or retain the null hypothesis?
4. What happens to power if:
a. b increases
b. N increases
c. s increases
5. For the following scores, compute the mean, median, and mode. Make sure to label your responses. (5 4 5 6 3 2 1). If you do not wish to do any calculations, please simply show your work.
6. Circle the set of mutually orthogonal coefficients and indicate how you know they are orthogonal.
-3 +1 +1 +1
+1 +1 +1 -3
0 0 +1 -1
-2 +1 +1
0 -1 +1
-3 +1 +2
0 +1 -1
-3 +1 +1 +1
2 +1 +1 0
-1 +1 0 0
7. With the following values, show how you would compute the population
standard deviation.
1 2 3 3 4
5 5 6 6 6 7 8
The sum of these scores = 56, and the sum of their squared scores = 310.
8. Show how you would find the 99% confidence interval for a sample mean of 10 and sample standard deviation of 4. The sample size is 91
9. Find the percentile rank for the score of 80 if m=90 and population standard deviation = 5. You don't need to do the computations, but if finding the percentile rank involves additional step(s), clearly indicate what step(s) are necessary.
10. Given the following totals, explain why there may or may not be an
interaction.
Total for men in a happy mood= 30.
Total for men in a sad mood = 30.
Total for women in a happy mood = 20.
Total for women in a sad mood= 30.
11. Create a source table for the 1-way independent groups ANOVA on the following data. As we discussed in class, you need to show how you would compute the values, but you need not carry out the calculations. If for some reason you feel compelled to waste time on computations, you still must show your work to receive any credit. Make sure that you find the degrees of freedom, show how you'd compute the mean square, etc.
Group A's raw scores are 7, 5, 6, 6. That total is 24 and the sum of the squared scores is 146. Group B's raw scores are 8, 9, 9, 9. That total is 35, and the sum of the squared scores is 307