Casio fx-CG10 Advanced Operation Manual page 72

Fostering Advanced Algebraic Thinking with Casio Technology
Sample Solution—Trends in Nightly Rates for Hotels (continued)
j. How accurate do you think these predictions will be? Explain.
These predictions are not accurate. The average nightly hotel rate cannot be a
negative number. This is an example of a set of regression equations that
provide us a lot of information about the trends within the given data, but are
not useful for extrapolating data—making predictions outside of the data set.