HP 10BII User Manual page 91

Linear Estimation.
EH XVHG WR HVWLPDWH D \YDOXH IRU D JLYHQ [YDOXH RU YLFH YHUVD
 (QWHU WKH [\ GDWD XVLQJ WKH LQVWUXFWLRQV RQ SDJH 
 (QWHU WKH NQRZQ [YDOXH RU \YDOXH
7R HVWLPDWH [ IRU WKH JLYHQ \ HQWHU WKH \YDOXH WKHQ SUHVV
7R HVWLPDWH \ IRU WKH JLYHQ [ HQWHU WKH [YDOXH WKHQ SUHVV
Example: Forecasting.
)RU WKH SDVW VL[ ZHHNV WKH PDQDJHU KDV NHSW UHFRUGV RI WKH QXPEHU RI
PLQXWHV RI DGYHUWLVLQJ WKDW ZHUH SXUFKDVHG DQG WKH VDOHV IRU WKDW ZHHN
Week






:KDW LV WKH \LQWHUFHSW WKH VORSH DQG WKH FRUUHODWLRQ FRHIILFLHQW"
S a l e s i n D o l l a r s
7KH VWUDLJKW OLQH FDOFXODWHG E\ OLQHDU UHJUHVVLRQ FDQ
$OL·V $]DOHDV DGYHUWLVHV RQ D ORFDO UDGLR VWDWLRQ
Minutes of Advertising
( x -values)
y
3 , 0 0 0 . 0 0
2 , 0 0 0 . 0 0
, 0 0 0 . 0 0
b






m = 4 2 5 . 8 8
2 3 4 5 6
M i n u t e s o f A d v e r t i s i n g
7: Statistical Calculations 91
3
4
Sales
( y -values)




 

( f o r e c a s t e d )
x
7 8