1. At what time was the temperature the highest?

a. 0900

b. 11:30

c. 1300

d. 1400

2. In regression analysis the symbol r represents the_________________ and the symbol,

R2, represents the _________________.

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a. coefficient of determination; predicted value

b. coefficient of determination; Multiple coefficient of determination

c. Pearson-r coefficient; total variability of Y accounted for by all the Xs

d. variability of Y accounted for by one independent variable; summation

3. Population median, population standard deviation, and the population mean are all

_________________.

a. measures of variability

b. examples of a parameter

c. measures of central tendency

d. examples of a statistic

4. ∑(X – ) is _________________.

a. the sample standard deviation

b. equal to zero

c. the sum of squares of the deviations about the sample mean

d. the sample mean

5. A professor asked his thirty students to take a statistics test. The scores from that test

ranged from 32 to 95, with a mean score of 75. The professor would like to determine

the average variability of the scores relative to the mean. Which statistical measure

would you ask him to use?

a. Pearson-r

b. Population mean

c. Standard deviation

d. Coefficient of determination

6. The stem-and-leaf plot below shows how a class of sixth-graders scored on a math test. A score

of 63 or higher is passing. How many sixth-graders passed this math test?

a. 7

b. 13

c. 11

d. 17

7. The z-score for a raw score of, 85, given that µ=105, and σ=10 is _________________.

a. 75

b. 2

c. -2

d. 20

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8. A bar graph can be used to present _________________data, and a frequency polygon

can be used to present _________________ data.

a. nominal scale; ratio scale

b. ratio scale; interval scale

c. nominal scale; ordinal scale

d. independent; population

9. A small company has 7 employees. The numbers of years these employees have

worked for this company are shown as follows:

4 14 3 16 9 8 16

Based upon this information, the median number of years that employees have been with this

company is:

a. 9 years

b. 16 years

c. 10 years

d. None of the above

10. In terms of sampling distributions of the mean, as sample size increases the standard error

of the mean _________________.

a. tends to zero

b. increases

c. remains the same

d. decreases

11. According to the box-and-whisker plot shown below, what is the third quartile value?

a. 70

b. 80

c. 90

d. 100

12. An example of a ratio scale variable is _________________.

a. Age group

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b. English exam scores

c. Position in the Olympic 100m race

d. Number of children per household

13. In the simple linear regression result, r2 =.47. What percentage of the variation in the

dependent variable is left UNEXPLAINED by the independent variable?

a. 53.0%

b. 47.0%

c. .47%

d. .53%

14. A data point on a scratter plot _________________.

a. represents a pair of scores on the scatter plot

b. is synonymous with a single score

c. represents more than two values

d. represents a single value on the graph

15. A professor took a sample of N=150 Wesley College students and found that the average

IQ was equal to 98 for this group. She then drew the conclusion that the average IQ was

equal to 98 for the entire population of students at Wesley’s College. This is an example of

---

.

a. probability

b. correlation

c. inferential statistics

d. descriptive statistics