HP 10bII - Page 91

Linear Estimation. The straight line calculated by linear regression can
be used to estimate a_y-value for a given x-value, or vice versa:
1. Enter the х,у data using the instructions on page 86.
2. Enter the known x-value or y-value.
= To estimate x for the given y enter the y-value, then press Q@2.
a To estimate у for the given x, enter the x-value, then press OG.
Example: Forecasting. Ali’s Azaleas advertises on a local radio station.
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 — тона PUE Б
1 2 $1,400
2 1 $920
3 3 $1,100
4 5 $2,265
5
5
$2,890
6 4 $2,200 |
What is the y-intercept, the slope, and the correlation coefficient?
x
y
P
d
N
es
~AS
3,000.00
^
(forecasted)
ye
2,000.00 t^ m= 425.88
Sales in Dotlars
1234 56 7 8
Minutes of Advertising
7: Statistical Calculations 91