section_b - Section B Preliminary Data Analysis 1 Outlier...

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Section B: Preliminary Data Analysis 1. Outlier Assessment - Table 1’s screening for outliers provides no evidence of outlier greater than 4 standard deviations from the norm. However, there are several data points under Rebate that are coming close to being outliers at 3.35 standard deviations from the mean, and should be considered Table 1 Outlier Screening Stat TV News Gas People Rebate List Mean 5.2 12.1 2.48 10.8 92.4 14.2178 Stdev 3.1 7.0 0.43 1.1 84.1 0.1684 Min 0 1.1 1.93 9.0 0 13.932 Max 12 31 3.35 12.0 374 14.556 Min SDs 1.70 1.56 1.28 1.71 1.10 1.70 Max SDs 2.21 2.70 2.05 1.08 3.35 2.01 2. Linearity - One variable was shown to have a non linear relationship. As shown in chart 1 below, The list price clearly does not have a linear relationship model. This will exclude this variable from the final model. Chart 1 -Sales vs List 55 60 65 70 75 80 85 13.800 13.900 14.000 14.100 14.200 14.300 14.400 14.500 14.600 List 3. Independence of Variables - Table 2 is a correlation test analyzing the relationships
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between the variables. TV and News are the only two variables shown to be correlated so two regression tests will be run to determine which of the two produces a more accurate
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