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Details Title: j382 stats Description: j382 stats Total Flash Cards: 23 Created: 11/27/2007 05:20:41	To study from this set of flash cards, or to create your own your own study flash cards, register HERE. If you are already a registered user, CLICK HERE.
Cards Term descriptive stats Definition helps describe data by reducint it for easier interpretation a-12, b-9, c-18  Term data distribution   Definition a collection of numbers 6,8,10  Term frequency distributions Definition group intervals, percentage, and cumulative frequency   0-10, 11-20  Term summary stats Definition helps make data more manageable   Term central tendency Definition what is a typical score? -uses one number to characterize distribution  Term dispersion (variance) Definition describes how data or scores are dispersed across a distribution Term 3 dispersion measures Definition range, variance, standard deviation Term range Definition difference between maximum vallue and minimum value in a distribution Term variance Definition statistical average of the amount of dispersion in a distribution of scores...how they vary from the mean Term standard deviation Definition difference between an individual score and the mean of a score of a distribution Term normal distribution (bell curve) Definition normalcy Term standardization and z-scores Definition -converts raw scores into standard deviation units -how far above or below the mean a score is in sdu -allows for comparisons of apples and oranges  Term null hypothesis Definition no significan difference Term standard error Definition always there because of how samples are drawn, generally 5%...confidence level Term central limit theorem Definition as long as you have a large enough sample, sampling distribution of the mean will be normally distributed -more than 30 samples are needed  Term t-test Definition comparing two groups' mean scores Term ANOVA Definition extension of the t-test and used to investigate several independent variables simultaneously Term correlations Definition measures how two variables change in relationship to another Term regression analysis Definition uses association between two variables to make predictions -_____to the normal curve  Term statistical methods Definition parametric and nonparametric Term chi-square (x^2) test Definition value that compares observed with expected frequencies -if the value equals or exceeds value on table, then statistically significant -use on content analysis, observation, experiment  Term cross-tabulation Definition same as x2 but two or more variables are tested at the same time Term z-scores Definition -compare scores from diff. methods -one of the most used stats