In a normal distribution, what percentage of the scores in the distribution falls within one standard deviation on either side of the mean? a. 34 percent b. 40 percent c. 50 percent d. 68 percent e. 95 percent

In a perfectly normal distribution of scores, which of the following statements is true? a. The mean, median, and mode are all the same number. b. The mode is equal to the standard deviation. c. The scores are positively correlated. d. The mean minus the mode equals the median. e. There is a positive skew to the distribution of data.

Which of the following is an example of negative correlation? a. People who spend more time exercising tend to weigh less. b. Teenage females tend to have fewer speeding tickets than teenage males. c. Students with lower IQ scores tend to have lower grades. d. As hours studying for a test decrease, so do grades on that test. e. Students' shoe sizes are not related to their grades.

\What is the range of the following: 12, 25, 33, 40, 80? a. 68 b. 98 c. 33 d. 38 e. 190

A researcher calculates statistical significance for her study and finds a 5 percent chance that results are due to chance. Which of the following is an accurate interpretation of this finding? a. This is well beyond the range of statistical significance. b. This is the minimum result typically considered statistically significant. c. This is not statistically significant. d. There is no way to determine statistical significance without replication of the study. e. Chance or coincidence is unrelated to statistical significance.

In a normal distribution, which of the following statements is true about the area that falls between one standard deviation above and one standard deviation below the mean?

Use the Empirical Rule to answer each question. In a normal distribution, what percent of the data lie a. within 3 standard deviations of the mean? b. below 2 standard deviations of the mean? c. between 2 standard deviations below the mean and 3 standard deviations above the mean?

Which of the following correlation coefficients represents the strongest relationship between two variables? a. +.30, b. +.75, c. +1.3, d. -.85, e. -1.2.

Find the x-intercept and the y-intercept of the graph of each equation. Then graph the equation.

y - x = -9

Approximately what percentage of scores fall between $-1$ and $+1$ standard deviations of a normal distribution?

In an experiment to test the effects of room temperature on test performance the independent variable is a. the scores on the test be fore the experiment begins. b. the scores on the test at the end of the experiment. c. whether the teacher was male or female. d. the temperature of the room. e. the style of test (multiple choice versus essay).

The laboratory environment is designed to a. exactly re-create the events of everyday life. b. re-create psychological forces under controlled conditions. c. re-create psychological forces under random conditions. d. minimize the use of animals and humans in psychological research. e. provide the opportunity to do case study research.

What is the range of the following: 12, 25, 33, 40, 80?

a. 68

b. 98

c. 33

d. 38

e. 190

Which measure of central tendency is most influenced by outliers (data that is extremely different from other data in the set)?

a. Mean

b. Median

c. Mode

d. Standard deviation

e. Histogram