Texas Instruments BA II Plus - Example: Computing Two-Variable Statistical Results

98 BA II PLUS™ Calculator
Example: Computing Two-Variable Statistical Results
(continued from previous example)
Procedure Keystrokes Display
Select and clear statistical
calculation portion of
Statistics worksheet.
& k
& z
LIN
Display intercept.
# # # #
# # # #
a= 47,115.38

Display slope.
#
b= 8,423.08

Display correlation.
#
r= 0.96

Enter X' (people).
#
10
!
X'= 10.00

Compute Y' (sales).
# %
Y'= 131,346.15

Enter Y' (sales).
115000
!
Y'= 115,000.00

Compute new X' (people).
" %
X'= 8.06

Because the correlation coefficient (
r
) of .96 is close to 1, the
following equation is a good approximation of the data.
Y = 47,115.38 + 8,423.08 × X
The analysis indicates that 10 salespeople would produce
approximately $131,346.15 in sales per month. To produce
$115,000 in sales per month, you would need approximately
eight salespeople.