Question

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

Requirement 1. Determine the companys cost equation (use the output from the Excel regression). (Round the amounts to two de

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Answer #1
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.
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