HP 10B User Manual
Page 95
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Linear Estimation.
The straight line calculated by linear regression
can be used to estimate ay-value for a given jc-valuc, or vice versa:
1.
Enter the A;y-data using the instructions on page
86
.
2. Enter the known x-valuc ory-valuc.
m
To estimate X for the giveny, enter thcy-valuc, then press
■da.
■ To cstimalcy for the given x, enter thex-valuc, then press
l(£^.
Example: Forecasting.
Ali's A/^ileus advertises on a local radio sta
tion. For the past six weeks, the manager has kept records of the number
of minutes of advertising that were purchased, and the sales for that week.
Week
Minutes of Advertising
(x-va lues)
Sales
((/-values)
Week 1
2
$1.400
Week 2
1
$ 920
Week 3
3
$1,100
Week 4
5
$2.265
Weeks
5
$2,890
Week 6
4
$2,200
What is they-intcrcepl, the slope, and the correlation coefficient?
92
7: Statistical Calculations