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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
probability of committing a type I error
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
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
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
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