Two-Variable Statistics Example - Texas Instruments BA II PLUS User Manual

Example: Computing One-Variable Statistical Results
Procedure
Select and clear statistical
calculation portion of Statistics
worksheet.
Select one-variable calculation
method.
Display sample size.
Display mean.
Display sample standard deviation.

Two-Variable Statistics Example

A life insurance company wants to explore the relationship
between the number of salespeople in an office and the volume
of sales. Offices in various cities have the following number of
salespeople and resulting total sales.
Number of salespeople
Treating the number of salespeople as the
sales per month as the
model to perform the following analysis.
• Determine the Y-intercept, slope, and correlation coefficient
of the data.
• Predict the amount of sales (
new office with 10 salespeople.
• Determine the number of salespeople needed (
produce $115,000 in monthly sales.
96
7
12
4
5
11
9
variable, use the linear regression
Y
Y'
Keystrokes Display
& k
& z
LIN
& V
& V
& V
& V
1-V
#
n=
#
x=
#
Sx=
Sales $ per month
99,000
152,000
81,000
98,000
145,000
112,000
variable and the
X
) if the company establishes a
X'
BA II PLUS™ Calculator
Q
10.00
Q
70.80
Q
4.08
) to