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### 18 Cards in this Set

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 accidental sampling a nonrandom sampling method whereby the researcher includes the most convenient cases in his or her sample alpha probability of committing a type I error alpha probability of committing a type I error analysis of variance a statistical test that makes a single overall decision as to whether a significant difference is present among three or more sample means central tendency what is average or typical of a set of data, a value generally located toward the middle or center of a distribution bimodal distribution a frequency distribution containing two or more modes chi-square a nonparametric test of significance whereby expected frequencies are compared against observed frequencies class interval a category in a group distribution containing more than one score value class limit the point midway between adjacent class intervals that serves to close the gap beatween them coefficient of determination equal to the Pearson's correlation squared, the proportion of variance in the dependent variable that is explained by the independent variable coefficient of nondeterminatin equal to one minus the Pearson's correlation squared, the proportion of variance in the dependent variable that is not explained by the independent variable columnn percent in a cross-tabulation, the result of dividing a cell frequency by the n;umber of cases in a column. column percents add up to 100% for each column of a cross tabulation confidence interval the range of mean values (proportions) within which the true population mean is likely to fall contingency coefficient based on chi-squrae, a measure of the degree of association of rnominal data arranged in a table larger than 2 by 2 correlation strength and direction between two variables correlation coefficient generally ranging between -1.00 and +1.00, a number in which both the strength and direction of correlation are expressed cross-tabulation the total number of cases having any given score or a score that is lower curvilinear correlation a relationship between x and y that begins as either positive or negative and then reverses direction