QUIZ CHAPTER FOUR

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 boats • 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 boats • 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