16.4 APPENDIX REVIEW
Statistics: Understanding Data

KEY POINTS

Descriptive Statistics

Inferential Statistics

KEY TERMS

Match each of the terms on the left with its definition on the right. Click on the term first and then click on the matching definition. As you match them correctly they will move to the bottom of the activity.

Question

correlation
correlation coefficient
descriptive statistics
frequency distribution
frequency polygon
histogram
inferential statistics
mean
measure of central tendency
measure of variability
median
mode
negative correlation
population
positive correlation
range
sample
scatter diagram or scatter plot
skewed distribution
standard deviation
standard normal curve or standard normal distribution
statistics
symmetrical distribution
t-test
Type I error
Type II error
z score
A finding that two factors vary systematically in opposite directions, one increasing as the other decreases.
A measure of variability; expressed as the square root of the sum of the squared deviations around the mean divided by the number of scores in the distribution.
A finding that two factors vary systematically in the same direction, increasing or decreasing together.
Failing to find a significant effect that does, in fact, exist.
The score that divides a frequency distribution exactly in half so that the same number of scores lie on each side of it.
An asymmetrical distribution; more scores occur on one side of the distribution than on the other. In a positively skewed distribution, most of the scores are low scores; in a negatively skewed distribution, most of the scores are high scores.
A distribution in which scores fall equally on both sides of the graph. The normal curve is an example of a symmetrical distribution.
The most frequently occurring score in a distribution.
A measure of variability; the highest score in a distribution minus the lowest score.
Mathematical methods used to determine how likely it is that a study's outcome is due to chance and whether the outcome can be legitimately generalized to a larger population.
A summary of how often various scores occur in a sample of scores. Score values are arranged in order of magnitude, and the number of times each score occurs is recorded.
A single number that presents information about the spread of scores in a distribution.
A symmetrical distribution forming a bell-shaped curve in which the mean, median, and mode are all equal and fall in the exact middle.
A way of graphically representing a frequency distribution; a type of bar chart that uses vertical bars that touch.
Test used to establish whether the means of two groups are statistically different from each other.
A branch of mathematics used by researchers to organize, summarize, and interpret data.
Erroneously concluding that study results are significant.
A number, expressed in standard deviation units, that shows a score's deviation from the mean.
The relationship between two variables.
A subset of a population.
A graph that represents the relationship between two variables.
Mathematical methods used to organize and summarize data.
A numerical indication of the magnitude and direction of the relationship (the correlation) between two variables.
The sum of a set of scores in a distribution divided by the number of scores; the mean is usually the most representative measure of central tendency.
A complete set of something—people, nonhuman animals, objects, or events.
A way of graphically representing a frequency distribution; frequency is marked above each score category on the graph's horizontal axis, and the marks are connected by straight lines.
A single number that presents some information about the "center" of a frequency distribution.