TEST PREP are you ready?

Question 1

1. With descriptive statistics, researchers use tables, graphs, and charts to:

  1. summarize data.

  2. make inferences about data.

  3. make predictions.

  4. test hypotheses.

a. summarize data.

Question 2

2. A classmate is collecting data for a research project incorporating a treatment group and a control group. When the data collection is complete, she will check for _______ to see if the differences between the two groups are due to the researcher’s manipulations.

  1. random sampling

  2. descriptive statistics

  3. standard deviations

  4. statistical significance

d. statistical significance

Question 3

3. In the following, identify the variable as quantitative (1) or qualitative (2):

  1. political affiliation

  2. hair color

  3. yearly income

  4. weight in pounds

a. 2; b. 2; c. 1; d. 1

Question 4

4. One common way to present data is to use a _______ , which displays how often various values in a data set are present.

  1. qualitative variable

  2. meta-analysis

  3. frequency distribution

  4. measure of variation

c. frequency distribution

Question 5

5. A researcher is looking to measure cognitive ability in a large representative sample. She can expect that the distribution will be symmetric and have a bell shape. This type of distribution is also known as a:

  1. normal curve.

  2. stem-and-leaf plot.

  3. qualitative variable.

  4. parameter.

a. normal curve.

Question 6

6. Numbers that represent the “middle” of data sets are known as:

  1. standard deviations.

  2. measures of central tendency.

  3. measures of variability.

  4. misleading.

b. measures of central tendency.

Question 7

7. What is the mean for a sample that includes the following values: 4, 4, 6, 3, 8?

  1. 4

  2. 5

  3. 6

  4. 7

b. 5

Question 8

8. What is the median for a sample that includes the following values: 4, 4, 6, 3, 8?

  1. 4

  2. 5

  3. 6

  4. 7

a. 4

Question 9

9. What is the mode for a sample that includes the following values: 4, 4, 6, 3, 8?

  1. 4

  2. 5

  3. 6

  4. 7

a. 4

Question 10

10. A value that is very different from the rest of the data set is called a(n) _______, and it can have a great influence on the _______.

  1. mode; median

  2. variable; mode

  3. outlier; mean

  4. outlier; median

c. outlier; mean

Question 11

11. A classmate is trying to calculate a measure of variability. He takes the highest value in the data set and subtracts the lowest value from it. This is considered the _______ of the data set.

  1. range

  2. central tendency

  3. median

  4. standard deviation

a. range

Question 12

12. What is the standard deviation for a sample that includes the following values: 4, 4, 6, 3, 8?

  1. 2

  2. 3

  3. 4

  4. 5

a. 2

Get personalized practice by logging into LaunchPad at www.macmillanhighered.com/launchpad/sciampresenting1e to take the LearningCurve adaptive quizzes for Appendix A.