AP Psychology Module 8

frequency polygon

A line figure used to present data from a frequency distribution

Normal distribution (measure of variability)

Standard bell curve based on cluster of data

Histogram

a bar graph depicting a frequency distribution

statistical significance

a statistical statement of how likely it is that an obtained result occurred by chance

Range (measure of variability)

is the difference between the largest (L) and smallest (S) value in a list of scores is the most informative when used to describe data sets without outliers includes only two values in its computation, regardless of the number of scores in a distribution

inferential statistics

numerical data that allow one to generalize- to infer from sample data the probability of something being true of a population

descriptive statistics

numerical data used to measure and describe characteristics of groups. Includes measures of central tendency and measures of variation.

Mean (measure of central tendency)

the arithmetic average of a distribution, obtained by adding the scores and then dividing by the number of scores

Median (measure of central tendency)

the middle score in a distribution; half the scores are above it and half are below it

Mode (measure of central tendency)

the most frequently occurring score(s) in a distribution