Quiz6

Psy302 Quantitative Methods

QUIZ CHAPTER SIX

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

B. median C. standard deviation D. skewness

E. all of the above

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

B. median C. standard deviation D. skewness

E. all of the above

2. The normal distribution is also called the symmetrical, Gaussian or ____ distribution. A. skewed B. bi-modal C. bell-shaped D. point-biserial E. all of the above

2. The normal distribution is also called the symmetrical, Gaussian or ____ distribution. A. skewed B. bi-modal C. bell-shaped D. point-biserial E. all of the above

3. Scores far from the mean are located in the ________ of a normal distribution. A. body

B. tails C. most sensitive areas D. most uncertain areas

E. a & c

3. Scores far from the mean are located in the ________ of a normal distribution. A. body

B. tails C. most sensitive areas D. most uncertain areas

E. a & c

4. The unit of measurement distributed along the x-axis of a standard normal distribution is referred to as a A. mean B. b-score C. hypotenuse D. z-score E. a & c

4. The unit of measurement distributed along the x-axis of a standard normal distribution is referred to as a A. mean B. b-score C. hypotenuse D. z-score E. 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 is A. less than 0

B. greater than 0 C. exactly equal to 0 D. 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 is A. less than 0

B. greater than 0 C. exactly equal to 0 D. 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 ztransformation. B. Find the probability of a z-score in the unit normal table. C. both A and B D. none of the above

6. Which of the following is required to locate proportions of area under the normal curve? A. Compute a ztransformation. B. Find the probability of a z-score in the unit normal table. C. both A and B D. 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. 0 B. 2 C. 4 D. 6 E. 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. 0 B. 2 C. 4 D. 6 E. 8

12  8 z  2 .0 2 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. 0 B. +1.o C. +6.0 D. -6.0 E. 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. 0 B. +1.o C. +6.0 D. -6.0 E. 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. 2 B. 4 C. 6 D. 8 E. 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. 2 B. 4 C. 6 D. 8 E. 10

11. Which of the following frequency distributions if positively skewed? 1. A 2. B 3. C

A

B

C

11. Which of the following frequency distributions if positively skewed? 1. A 2. B 3. C

A

B

C

The End