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18 Cards in this Set
- Front
- Back
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accidental sampling
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a nonrandom sampling method whereby the researcher includes the most convenient cases in his or her sample
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alpha
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probability of committing a type I error
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alpha
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probability of committing a type I error
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analysis of variance
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a statistical test that makes a single overall decision as to whether a significant difference is present among three or more sample means
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central tendency
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what is average or typical of a set of data, a value generally located toward the middle or center of a distribution
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bimodal distribution
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a frequency distribution containing two or more modes
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chi-square
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a nonparametric test of significance whereby expected frequencies are compared against observed frequencies
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class interval
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a category in a group distribution containing more than one score value
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class limit
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the point midway between adjacent class intervals that serves to close the gap beatween them
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coefficient of determination
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equal to the Pearson's correlation squared, the proportion of variance in the dependent variable that is explained by the independent variable
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coefficient of nondeterminatin
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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
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columnn percent
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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
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confidence interval
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the range of mean values (proportions) within which the true population mean is likely to fall
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contingency coefficient
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based on chi-squrae, a measure of the degree of association of rnominal data arranged in a table larger than 2 by 2
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correlation
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strength and direction between two variables
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correlation coefficient
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generally ranging between -1.00 and +1.00, a number in which both the strength and direction of correlation are expressed
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cross-tabulation
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the total number of cases having any given score or a score that is lower
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curvilinear correlation
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a relationship between x and y that begins as either positive or negative and then reverses direction
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