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18 Cards in this Set
 Front
 Back
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


chisquare

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 crosstabulation, 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 chisqurae, 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


crosstabulation

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
