1. A doctor kept a record of all the height measurements of patients who visited the clinic. Which measure of central tendency should the doctor use to determine the average height of all the patients?

a. mode

b. mean

c. median

d. the average height cannot be determined

2. Measures of variability describe:

a. the shape of the distribution

b. the distance between scores

c. the most typical score

d. the difference between a sample and a population

3. A sample consists of n = 40 scores. How many of the scores will be used to calculate the range?

a. 2

b. 40

c. 39

d. 20

4. On a statistics score Matt received a score that is equal to z = -2. This score indicates a position in a distribution ____________.

a. above the mean by 2 points

b. below the mean by 2 points

c. below the mean by 2 standard deviations

d. above the mean by 2 standard deviations

5. For a distribution of scores, which of the following z-scores represents the location closest to the mean?

a. z = +2.7

b. z = +3.2

c. z = -1.1

d. z = -2.3

6. A percentile rank

a. Identifies the proportion of the normal distribution that is at or below a particular score

b. Identifies the proportion of the normal distribution that is at or above a particular score

c. Identifies the distance from the mean

d. Identifies the dispersion of the scores

7. A ___________ is an original value, whereas a __________ is a score that has been transformed.

a. standard deviation, variance

b. the standard score, raw score

c. raw score, standard scored. mean, median

8. . A simple random sample is

a. a sample in which every member of the population has an equal chance of being selected

b. equal to the population of interest

c. has at least 30 members

d. all of the above

9. . A researcher wants to measure anxiety of college seniors. He administers his measure to 50 students enrolled into his advanced statistics class. What kind of sample did he use?

a. a sample of convenience

b. a simple random sample

c. a stratified random sample

d. a statistical sample

`10. The difference between a population parameter and a sample statistic is known as _______.

a. variance

b. sampling error

c. standard deviation

d. a big mistake