QUIZ CHAPTER FOUR

Psy302 Quantitative Methods

1. Variability is a measure of:

A. spreadB. central tendencyC. popularityD. the middleE. all of the above

1. Variability is a measure of:

A. spreadB. central tendencyC. popularityD. the middleE. all of the above

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.A. meanB. rangeC. modeD. standard

deviationE. sum of squares

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.A. meanB. rangeC. modeD. standard

deviationE. sum of squares

3. The range is seldom used as a primary measure of variability in research because:A. it is difficult to

computeB. it is highly skewedC. it measures

central tendencyD. it is based on two

valuesE. all of the above

3. The range is seldom used as a primary measure of variability in research because:A. it is difficult to

computeB. it is highly skewedC. it measures

central tendencyD. it is based on

two valuesE. all of the above

4. The mean is not used as a primary measure of variability in research because:A. it is difficult to

computeB. it is highly skewedC. it measures

central tendencyD. it is based on two

valuesE. all of the above

4. The mean is not used as a primary measure of variability in research because:A. it is difficult to

computeB. it is highly skewedC. it measures

central tendency

D. it is based on two values

E. all of the above

5. Which of the following is an example of a distribution with NO variability?

A. scores: 3, 5, 4, 4, 5, and 3

B. scores: 3, 3, 3, 3, 33, and 3

C. scores: 1, 2, 3, 4, 5, and 6

D. scores: 5, 5, 5, 5, 5, and 5

5. Which of the following is an example of a distribution with NO variability?

A. scores: 3, 5, 4, 4, 5, and 3

B. scores: 3, 3, 3, 3, 33, and 3

C. scores: 1, 2, 3, 4, 5, and 6

D. scores: 5, 5, 5, 5, 5, and 5

6. The degrees of freedom for the sample variance:

A. are equal to the sample size

B. are equal to the sample size minus one

C. can vary between – and +

D. both B and C

6. The degrees of freedom for the sample variance:

A. are equal to the sample size

B. are equal to the sample size minus one

C. can vary between – and +

D. both B and C

7. Which of the following is true?

A. the standard deviation measures central tendency

B. the mean measures variabilityC. the standard deviation is always

positiveD. the standard deviation is used to

describe qualitative dataE. all of the above

7. Which of the following is true?

A. the standard deviation measures central tendency

B. the mean measures variabilityC. the standard deviation is always

positiveD. the standard deviation is used to

describe qualitative dataE. all of the above

8. Which of the following is a measure of spread or variability?

A. meanB. ogiveC. varianceD. square rootE. skewness

8. Which of the following is a measure of spread or variability?

A. meanB. ogiveC. varianceD. square rootE. skewness

9. Which shows more size variablity, the 6 boats or the 15 ducklings?

A. the boatsB. the ducksC. they are the sameD. all of the above

9. Which shows more size variablity, the 6 boats or the 15 ducklings?

A. the boatsB. the ducksC. they are the sameD. all of the above

10. The empirical rule states that for any normally distributed set of data, 99.7% of values lie within ____ of the mean.A. 3 standard

deviationsB. 6 raw score unitsC. rangeD. sight E. all of the above

10. The empirical rule states that for any normally distributed set of data, 99.7% of values lie within ____ of the mean.A. 3 standard

deviationsB. 6 raw score unitsC. rangeD. sight E. all of the above

The End