User`s guide

Statistical Calculations
117
At what temperature would the manager predict to sell 800 drinks? How many employees
will be needed for tomorrow's predicted temperature of 43
o
C?
Continuing with this example, modify this data by adding more points: two additional days
of sales and their corresponding temperatures. The first day’s temperature of 43
o
C resulted in
the sale of 1,023 cold drinks. The next day’s temperature at 37
o
C resulted in the sale of 685
drinks.
Table 12-3 Example entering statistical data, opening the editor, and predicting
Keys Display Description
\t
STAT CLR
(message flashes briefly,
then disappears)
Clears the statistics memory.
DGÆYJV¡
1.00 Enters first ordered pair.
DVÆVJV¡
2.00 Enters the second ordered pair.
DgÆjGV¡
3.00 Enters the third ordered pair.
v¡
1 32.00 Open the editor. Displays X
annunciator.
11111
3 725.00 Scroll and verify the data points,
starting with the x-value of the
first pair. The y-value of the third
pair is displayed.
M
Exit the editor.
]LY
0.00 Set the regression model to
power. 4–POWER flashes briefly
after
Y is pressed, then
disappears.
g::\Z
39.49 Predict the temperature.
\«\5d
.988080878 Display the correlation
coefficient.
YD\W\5G
1,053.49 Predict the number of drinks sold
tomorrow.
aG::4
5.27 Manager should have at least 6
employees at work tomorrow to
cover the expected load.