Shipping option decision by linear regression on TI-84

An online store offered the following shipping options:

Monday – $142
Tuesday – $86
Friday – $63
shippingcharge1

Applying linear regression in TI-84, the following parameters are obtained.
shippingcharge2shippingcharge3

Plotting the results in Stat Plot:
shippingcharge4shippingcharge6

It therefore appears delivery on Tuesday is the most appealing choice.

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