1. Quiz

2. 1 Which of the following is correct?
An independent variable (IV) is manipulated; the dependent variable (DV) is calculated
An IV is measured; the DV is manipulated
An IV is calculated; the DV is measured
An IV is manipulated; the DV is measured

3. 2 Which of the following is correct?
The variance is the squared deviation of scores around the mean
The variance is the square root of the average deviation of scores around the mean
The variance is the squared average deviation of scores around the mean
The variance is the average squared deviation of scores around the mean

4. 3 Which of the following is correct?
The variance is the squared standard deviation
The standard deviation is the variance multiplied by the mean
The variance is the square root of the standard deviation
The variance is the standard deviation divided by the mean

5. 4 What is the best answer?
ANOVA calculates and compares the variance of two experimental conditions
ANOVA calculates and compares the variability accounted for by IVs relative to the residual (error) variability
ANOVA compares the variance of a control group and an experimental group
ANOVA calculates the variance of three or more experimental groups

6. 5 Which of the following is correct?
F(1,r) = 1/t(r)
t(r) = 1/F(1,r)
F(1,r) = t2(r)
F(1,r) = sqrt(t2(r))

7. 6 Which of the following is correct?
A sum of squares is the squared average deviation of a set of scores around their mean
A sum of squares is the squared average deviation of a set of scores around their median
A sum of squares is the sum of deviations of a set of scores around their mean
A sum of squares is the squared deviation of a set of scores around the arithmetic mean

8. 7a Which of the following is correct?
There is only one normal distribution
There are two normal distributions
There are as many normal distributions as there are t distributions
There is an infinite number of normal distributions

9. 7b Which of the following is correct?
a normal distribution is symmetric and can be plotted as a bell-shaped curve
is positively skewed
is negatively skewed
is platikurtic and can be plotted as a bell-shaped curve

10. 8 A standard error is the standard deviation of the median
the standard deviation of the mean
the standard deviation of a set of scores
the residual variability in a normal distribution

11. 9 Which of the following is correct?
ratio: data with a relative zero point; interval: data with equal intervals; ordinal: ranked data
interval: data with equal intervals; ordinal: data with equal frequencies of ranks; nominal: categories rather than numbers
ratio: data with an absolute zero point; interval: data with equal intervals; nominal: data with categories rather than numbers
interval: data with equal intervals; ordinal: equal frequencies of ranks; nominal: dichotomised numerical values

12. 10a Which of the following is incorrect?
A correlation coefficient represents the extent of association between two variables
An unstandardised regression coefficient represents the amount of change in the criterion variable as a result of one unit change in a predictor
The range of the correlation coefficient is restricted
The range of the unstandardised regression coefficient is restricted

13. 10b Which of the following is correct?
A correlation coefficient is a constant fraction of the corresponding multiple regression coefficient
A correlation coefficient is the percentage of variability explained by the regression equation with a corresponding multiple regression coefficient
A correlation coefficient equals the multiple regression coefficient if deviation scores are used
A correlation coefficient is independent of measurement unit of data, but regression coefficients differ depending on unit of measurement

14. 11 Which of the following is correct?
-10  -11 = 110
-10  10 = 100
11  -10 = 110
10  -12 = 120

15. 12 Which of the following is incorrect?
= 2
= -3
= -2
= 8

16. 13 Which of the following is correct?
3  = 27
3 + 2  5 = 25
 7 = 14
4 = 18

17. 14 Which of the following is incorrect?

18. 15 Which of the following is correct?
-10  -11 = -110
-10  11 = 110
-11  -10 = 110
11  -10 = 110

19. 16 Which of the following is correct?
z = mean/SD
z = (X - mean)/SD
z = (X - mean)/r
z = SD/mean

20. 17 Which of the following is incorrect?

21. 18 Which of the following is correct?
|-2| = -2  2
|10| = 10  10
|7| = -7
|-4| = 4