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The best t line is represented by the equation where represents the total bill in dollars, and represents the percentage of the bill left as a tip.
a. What does the best t line estimate for the percentage of the bill left as a tip when the bill is $15? Is this reasonable?
b. What does the best t line predict for the percentage of the bill left as a tip when the bill is $50? Is this reasonable?
Solution
a. 17.62% since . This is reasonable based on the data since it is consistent with the rest of the data.
b. -4.5% since . This is not reasonable since a negative value does not make sense for a percentage of the bill to leave as a tip.
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Teacher Guide Algebra
