Kerri Rafferty, owner of Tulip Time, operates a local chain of floral shops. Each shop has its own delivery van. Instead of charging a flat delivery fee, Rafferty wants to set the delivery fee based on the distance driven to deliver the flowers. Rafferty wants to separate the fixed and variable portions of her van operating costs so that she has a better idea how delivery distance affects these costs. She has the following data from the past seven months
SUMMARY OUTPUT | ||||||||
Regression Statistics | ||||||||
Multiple R | 0.87861966 | |||||||
R Square | 0.7719725 | |||||||
Adjusted R Square | 0.726367 | |||||||
Standard Error | 184.004138 | |||||||
Observations | 7 | |||||||
ANOVA | ||||||||
df | SS | MS | F | Significance F | ||||
Regression | 1 | 573112.387 | 573112.387 | 16.9271802 | 0.00922537 | |||
Residual | 5 | 169287.613 | 33857.5226 | |||||
Total | 6 | 742400 | ||||||
Coefficients | Standard Error | t Stat | P-value | Lower 95% | Upper 95% | Lower 95.0% | Upper 95.0% | |
Intercept | 908.93462 | 1086.52017 | 0.83655568 | 0.4409781 | -1884.0544 | 3701.92362 | -1884.0544 | 3701.92362 |
X Variable 1 | 0.28107523 | 0.06831723 | 4.11426545 | 0.00922537 | 0.10546019 | 0.45669026 | 0.10546019 | 0.45669026 |
1) | ||||||||
Y = 0.28 X + $908.93 | ||||||||
2) | ||||||||
R square | 0.7719725 | |||||||
3) | ||||||||
The R-square indicates that the cost equation explains 77.19% of the variability in the data. In other words, it should be used with caution may or may not feel confident using this cost equation to predict total costs at other volumes within the same relevant range. | ||||||||
4) | ||||||||
Y = 0.28 x 15000 miles + $908.93 | $ 5,125.06 | |||||||
5) | ||||||||
Since r- square is between .50 and .80, the company should use the cost equation with caution. | ||||||||
Kerri Rafferty, owner of Tulip Time, operates a local chain of floral shops. Each shop has...
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