DB 3-Quantitative Methods

DB 3-Quantitative Methods - P-Value Confidence Interval 95...

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Summary Multiple R R-Square Adjusted R-Square StErr of Estimate 0.6730 0.4529 0.4415 7.3947 ANOVA Explained Degrees of Freedom Sum of Squares Mean of Squares F-Ratio P-Value 1 2172.88 2172.88 39.7366 <0.0001 Unexplained Degrees of Freedom Sum of Squares Mean of Squares F-Ratio P-Value 48 2624.74 54.68208 Regression Table Constant Coefficient Standard Error T-Value P-Value Confidence Interval 95% 25.12642 11.88259 2.1146 0.0397 (L) 1.234881 (U) 49.01796 Promote Coefficient Standard Error T-Value
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Unformatted text preview: P-Value Confidence Interval 95% 0.762296 0.120928 6.3037 <0.0001 (L) 0.519154 (U) 1.005439 The slope is 0.7623- which indicates that the sales index tends to increase by about 0.76 for each 1-unit increase in the promotional expenses index. 2/3 of the predictions will be within 7.39 of the actual sales values, and about 95% of the predictions will be within 2 standard errors, or 14.78, of the actual sales values. This is a pretty high level of variation when used in predictions....
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