1. Psy302 Quantitative Methods
QUIZ CHAPTER FOUR

2. 1. Variability is a measure of:
spread
central tendency
popularity
the middle
all of the above

3. 1. Variability is a measure of:
spread
central tendency
popularity
the middle
all of the above

4. 2. The ____ is the simplest way to describe how dispersed or spread out scores are. It involves the difference between the largest value and the smallest value.
mean
range
mode
standard deviation
sum of squares

5. 2. The ____ is the simplest way to describe how dispersed or spread out scores are. It involves the difference between the largest value and the smallest value.
mean
range
mode
standard deviation
sum of squares

6. 3. The range is seldom used as a primary measure of variability in research because:
it is difficult to compute
it is highly skewed
it measures central tendency
it is based on two values
all of the above

7. 3. The range is seldom used as a primary measure of variability in research because:
it is difficult to compute
it is highly skewed
it measures central tendency
it is based on two values
all of the above

8. 4. The mean is not used as a primary measure of variability in research because:
it is difficult to compute
it is highly skewed
it measures central tendency
it is based on two values
all of the above

9. 4. The mean is not used as a primary measure of variability in research because:
it is difficult to compute
it is highly skewed
it measures central tendency
it is based on two values
all of the above

10. 5. Which of the following is an example of a distribution with NO variability?
scores: 3, 5, 4, 4, 5, and 3
scores: 3, 3, 3, 3, 33, and 3
scores: 1, 2, 3, 4, 5, and 6
scores: 5, 5, 5, 5, 5, and 5

11. 5. Which of the following is an example of a distribution with NO variability?
scores: 3, 5, 4, 4, 5, and 3
scores: 3, 3, 3, 3, 33, and 3
scores: 1, 2, 3, 4, 5, and 6
scores: 5, 5, 5, 5, 5, and 5

12. 6. The degrees of freedom for the sample variance:
are equal to the sample size
are equal to the sample size minus one
can vary between – and +
both B and C

13. 6. The degrees of freedom for the sample variance:
are equal to the sample size
are equal to the sample size minus one
can vary between – and +
both B and C

14. 7. Which of the following is true?
the standard deviation measures central tendency
the mean measures variability
the standard deviation is always positive
the standard deviation is used to describe qualitative data
all of the above

15. 7. Which of the following is true?
the standard deviation measures central tendency
the mean measures variability
the standard deviation is always positive
the standard deviation is used to describe qualitative data
all of the above

16. 8. Which of the following is a measure of spread or variability?
mean
ogive
variance
square root
skewness

17. 8. Which of the following is a measure of spread or variability?
mean
ogive
variance
square root
skewness

18. 9. Which shows more size variablity, the 6 boats or the 15 ducklings?
the ducks
they are the same
all of the above

19. 9. Which shows more size variablity, the 6 boats or the 15 ducklings?
the ducks
they are the same
all of the above

20. 10. The empirical rule states that for any normally distributed set of data, 99.7% of values lie within ____ of the mean.
3 standard deviations
6 raw score units
range
sight
all of the above

21. 10. The empirical rule states that for any normally distributed set of data, 99.7% of values lie within ____ of the mean.
3 standard deviations
6 raw score units
range
sight
all of the above

22. The End