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95 percent analysis of variance cars cell chi-square coefficient of variation compared comparison computer files computer record considered contacts continuous data correlation count cross-tabulation table cumulative frequency customers data items data points data-entry degrees of freedom dependent variable determine employees example expected extreme F statistic factors females Figure frequency column Frequency Frequency frequency table grades graph hemoglobin jail Kurtosis labeled data less level of significance look males mean average measurement median mode myoglobin negative normal distribution obtained pairs t-test percentage physical therapy postrace predict prerace previous felony arrests produced puter question race range regression equation relationship response salary salesperson scatter diagram set of data shown in Table shows significant difference slope standard deviation standard error straight line survey t-test teacher test scores tion total number units sold variation z-score