# Shared Flashcard Set

## Details

Experimental Psych Chapter 10 Bold
jklfds
18
Agriculture
04/15/2012

Term
 statistics
Definition
 a set of mathematical procedures for summarizing and interpreting observations
Term
 data
Definition
 numerical or categorical facts about specific people or things
Term
 descriptive statistics
Definition
 most fundamental branch of stats that is used to summarize or describe a set of observations
Term
 inferential statistics
Definition
 the branch of statistics used to interpret or draw inferences about a set of observations
Term
 central tendency
Definition
 the avergae of a set of observations
Term
 dispersion
Definition
 variability of a set of scores
Term
 range
Definition
 the difference between the higest and lowest value in the entire set of scores
Term
 standard deviation
Definition
 a special kind of average measure of how much a score in the sample differs from the sample mean
Term
 rectangular distribution
Definition
 all the scorse in this distribution are about equally frequent/ probable (a single six- sided die)
Term
 bimodal distribution
Definition
 when two distinct ranges of scores are more common than any other (the heights of athletes attending the annual sports banquet for a very large high school with only 2 sports teams: gymnastics and bball)
Term
 normal distribution
Definition
 a symmetrical bell shaped distribution in which most scores cluster near the mean and in which scores become increasingly rare as they become increasingly distant from the mean (distributions of height, wesght, extroversion, ect)
Term
 null hypothesis
Definition
 begin by assuming that their own predictions are wrong
Term
 alternative hypothesis
Definition
 opposite of null hypothesis; the hyopthesis that any observed differences between the experimental and the control group are real
Term
 alpha level
Definition
 the statistcal equivalent of the princeiple of reasonable doubt that is the reasonable standard for rejecting the null hypothesis.
Term
 probability
Definition
 the number of all specific outcomes that qualify as the event in question divided by the total number of all possible outcomes.
Term
 type 1 error
Definition
 incorrectly rejecting the null hypothesis when it is in fact correct
Term
 type 2 error
Definition
 when we fail to reject an incorrect null hypothesis, that is when we fail to realize that our study has revealed something meaningful (usually that our hypothesis is correct)
Term
 effect sizes
Definition
 indicators of the strength or magnitude of their effects
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