HP 17bll+ User Manual page 137

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The correlation coefficient calculated above is acceptable to BJ's. Using
the linear model, estimate what the level of sales would be if the
business purchased 7 minutes of advertising time per week.
7
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How many minutes of advertising should BJ's buy if it wants to attain
sales of $3,000?
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3000
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If the model named here is not the one you want to use, press
and select the one you want.
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This result is not the same as it would be if SALES were the independent (x)
variable, and MINUTES were the dependent (y) variable.
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10: Running Total and Statistics 137
Selects MINUTES as x-list,
SALES as y-list, indicates
current curve-fitting
model, and displays
FRCST menu.
Correlation coefficient for
linear model.
Stores 7 in variable
MINUTES.
Forecasts the sales
resulting from 7 minutes of
radio advertising.
The business should buy
about 6 minutes of
advertising for sales of
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$3,000.
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