13 total questions!!

Please remember to show all of your work.

_____ 1. A psychologist is most likely to calculate Z scores in order to

compare scores obtained from two different scales.

compare the skew of two different distributions.

determine how far above or below the median a score is.

determine the shape of a distribution of scores.

_____ 2. A psychologist who constructs a frequency table to summarize data collected on the amount of stress people have experienced in the last 2½ weeks is using

a measure of central tendency.

a descriptive statistical method.

an intuitive statistical method.

an inferential statistical method.

_____ 3. The number of problems correct on a test is an example of a

continuous variable.

discrete variable.

log-linear variable.

quadratic variable.

_____ 4. A distribution is negatively skewed. The measures of central tendency are most likely to be in this order

mean = 30, median = 50, mode = 70

mean = 30, median = 70, mode = 50

mean = 50, median = 50, mode = 50

mean = 70, median = 50, mode = 30

_____ 5. If the exact degree of difference between two scores has no meaning beyond the fact that one is higher than the other, the level of measurement is

nominal.

extraneous.

rank-order.

equal-interval.

_____ 6. The length of time a person talks in a group discussion is an example of a(n)

continuous variable.

categorical variable.

transformed variable.

extraneous variable.

_____ 7. A population has μ = 100 and σ = 10. If these scores are transformed into Z-scores, the population of Z-scores will have a mean of and a standard deviation of .

100 and 10

10 and 1

1 and 1

0 and 1

_____ 8. Using the percentage approximations for the normal curve, the percentage of scores between the mean and one standard deviation below the mean is

14%

50%

34%

14% + 34% = 48%

_____ 9. The best way to display a nominal variable is to use a

histogram.

grouped frequency table.

bar graph.

line graph.

_____ 10. Values that describe a sample and a population are

called, respectively, parameters and statistics.

called, respectively, statistics and parameters.

both called parameters.

both called statistics.

11. A prison psychologist recorded the number of rule infractions for 15 prison inmates over a six-month period to be 5, 4, 2, 4, 3, 5, 2, 0, 4, 4, 5, 5, 3, 4, and 3. (12 points)

Construct the frequency table for this data. (2 points)

Create a histogram based on the frequency table. (2 points)

Describe in words the shape of the histogram. (1 point)

Calculate the three measures of central tendency. (3 points)

Calculate variance and standard deviation. (4 points)

12. The distribution of the GRE-Q in the population is normal with μ = 500, σ = 50.

Assume you are interested in the people who are "most extreme" (low or high) on the GRE. You elect to define the "most extreme" as the most extreme 5% of the population. What are the scores that separate the most extreme 5% of the population (from the middle 95%)? (5 points)

Hint: You will need to consult Table A-1.

What proportion of the population scores equal to or lower than 600? (5 points)

Hint: You will need to consult Table A-1.

13. Molly wants to pursue a graduate degree at New York University (NYU) but is unsure whether to specialize in law or medicine. To help her decide, she takes the MCAT and LSAT exams.

LSAT: Molly's score = 120; Students at NYU: M = 150, SD = 15

MCAT: Molly's score = 52; Students at NYU: M = 40, SD = 6

What are Molly’s Z-scores? (4 points)

In relation to other students at NYU, on which test did Molly get the better score? How do you know? (4 points)

Subject | Mathematics |

Due By (Pacific Time) | 09/07/2014 12:00 am |

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