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
ye
2,000.00
t^
m= 425.88
Sales in Dotlars
1234
56
7 8
Minutes of Advertising
7: Statistical Calculations
91