QUIZ CHAPTER SIX

Psy302 Quantitative Methods

1. The normal distribution can be defined by its mean and ____.

A. modeB. medianC. standard

deviationD. skewnessE. all of the above

1. The normal distribution can be defined by its mean and ____.

A. modeB. medianC. standard

deviationD. skewnessE. all of the above

2. The normal distribution is also called the symmetrical, Gaussian or ____ distribution.A. skewedB. bi-modalC. bell-shapedD. point-biserialE. all of the above

2. The normal distribution is also called the symmetrical, Gaussian or ____ distribution.A. skewedB. bi-modalC. bell-shapedD. point-biserialE. all of the above

3. Scores far from the mean are located in the ________ of a normal distribution.A. bodyB. tailsC. most sensitive

areasD. most uncertain

areasE. a & c

3. Scores far from the mean are located in the ________ of a normal distribution.A. bodyB. tailsC. most sensitive

areasD. most uncertain

areasE. a & c

4. The unit of measurement distributed along the x-axis of a standard normal distribution is referred to as a A. meanB. b-scoreC. hypotenuseD. z-scoreE. a & c

4. The unit of measurement distributed along the x-axis of a standard normal distribution is referred to as a A. meanB. b-scoreC. hypotenuseD. z-scoreE. a & c

5. A researcher finds that the average preschool-aged child drinks two cups of milk per day. Assuming these data are normally distributed, the z-score for the average cups per day in this example isA. less than 0B. greater than 0C. exactly equal to 0D. There is not

enough information to answer this question.

5. A researcher finds that the average preschool-aged child drinks two cups of milk per day. Assuming these data are normally distributed, the z-score for the average cups per day in this example isA. less than 0B. greater than 0C. exactly equal to 0D. There is not enough

information to answer this question.

6. Which of the following is required to locate proportions of area under the normal curve?A. Compute a z-

transformation.B. Find the

probability of a z-score in the unit normal table.

C. both A and BD. none of the above

6. Which of the following is required to locate proportions of area under the normal curve?A. Compute a z-

transformation.B. Find the

probability of a z-score in the unit normal table.

C. both A and BD. none of the above

7. For a normally distributed sample of scores with a mean of 8 and standard deviation of 2 what is the z-score for a raw score of 12?A. 0B. 2C. 4D. 6E. 8

7. For a normally distributed sample of scores with a mean of 8 and standard deviation of 2 what is the z-score for a raw score of 12?

A. 0B. 2C. 4D. 6E. 8

00.22

812

z 0.22

812

z

x

8. What percent of raw scores fall below the mean?

A. 25%B. 50%C. 75%D. 100%

8. What percent of raw scores fall below the mean?

A. 25%B. 50%C. 75%D. 100%

9. For a normally distributed sample of scores with a mean of 8 and standard deviation of 2, what z score corresponds to a raw score of 6?

A. -1. 0B. +1.oC. +6.0D. -6.0E. 0

9. For a normally distributed sample of scores with a mean of 8 and standard deviation of 2, what z score corresponds to a raw score of 6?

A. -1. 0B. +1.oC. +6.0D. -6.0E. 0

10. For a normally distributed sample of scores with a mean of 8 and standard deviation of 2, what z score corresponds to a z-score of +1.0 ?

A. 2B. 4C. 6D. 8E. 10

10. For a normally distributed sample of scores with a mean of 8 and standard deviation of 2, what raw score corresponds to a z-score of +1.0 ?

A. 2B. 4C. 6D. 8E. 10

11. Which of the following frequency distributions if positively skewed?

A

C

B1. A2. B3. C

11. Which of the following frequency distributions if positively skewed?

A

C

B1. A2. B3. C

The End