10: Running Total and Statistics 137
"
0;<4"
"
F19HF"
FH9H7: @ O12;1J9H"
9;<H12
*
"
Selects MINUTES as x-list,
SALES as y-list, indicates
current curve-fitting
model, and displays
FRCST menu.
™
7E228(&,(" Correlation coefficient for
linear model.
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
"
0;<4"
0;<4:HF8-&((" Stores 7 in variable
MINUTES.
"
F19HF"
F19HF8%K%.-&%*" Forecasts the sales
resulting from 7 minutes of
radio advertising.
How many minutes of advertising should BJ’s buy if it wants to attain
sales of $3,000?
3000
"
F19HF"
"
0;<4"
"
0;<4:HF8'&#'"
The business should buy
about 6 minutes of
advertising for sales of
$3,000.
†
*
If the model named here is not the one you want to use, press
)
œ
and select the one you want.
†
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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