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Class notes and answer key where students are given a dot plot of the total team payroll each team in MLB and the NFL. Data is also supplied as TNS file to be used on the Texas Instruments NSpire. Based on the dot plots students estimate the mean, median, and standard deviation for each data set, calculate the exact values using the NSpire file, and compare their estimates to the real values. The second example investigates the mean, median, and standard deviation of the ages of two groups, and asks follow-up questions that relate to the data.