Module 0.6 Flashcards
(14 cards)
Descriptive Statistics
numerical data used to measure and describe characteristics of groups; include measures of central tendencies and measures of variation.
Histogram
A bar graph depicting a frequency distribution
Mode
The most FREQUENTLY occuring score (s) in a distribution. Ex: 12, 17, 19, 23, 45, 12, 56 The mode is 12
Mean
The arithmetic average of a distribution, obtained by adding the scores and then dividing by the number of scores. Ex: 5, 10, 15, 20, 25. 5+10+15+20+25=75. 75/5=15 The mean is 15
Median
The middle score in a distribution; half the scores are above it and half are below it. Ex: 2, 4, 6, 8, 10. The median is 6.
Percentile Rank
The percentage of scores that are lower than a given score
Skewed Distribution
A representation of scores that lack symmetry around their average value.
Range
The difference between the highest and lowest scores in a distribution. Ex: 2, 4, 6, 8, 10. 10-2=8 The range is 8
Standard Deviation
A computed measure of how much scores vary around the mean
Normal Curve
A symmetrical, bell-shaped, curve that describes the distribution of many types of data; most scores fall near the mean (about 67% fall within 1 standard of it) and fewer & fewer scores lie near the extremes (also called a normal distribution).
Inferential Statistics
Numerical data that allow one to generalize - to infer from sample data the probability of something being true of a population
Meta-analysis
A statistical procedure for analyzing the results of multiple studies to reach an overall conclusion.
Statistical Significance
A statistical statement of how likely it is that a result (such as a difference between samples) occurred by chance, assuming there is no difference between the populations being studied.
