Beachcomber Ltd in a local car dealership that sells used and new vehicles. The manager of the company wants to know how different variables affect the sales of his vehicles. A random sample of yearly data was taken with the view to testing the model: SALES=a+BAGE+YMIL+8ENG Where SALES= amount that a vehicle is sold for($000's), AGE = age of the vehicle, MIL= the total mileage of the vehicle at the point of sale and ENG = the size of the engine. The sample of data was processed using MINITAB and the following is an extract of the output obtained: The regression equation is ***** Coef StDev t-ratio p-value Predict or Constan 1.7586 0.2525 6.9648 0.0000 t 0.2124 0.3175 0.3586 AGE 0.5042 MIL -0.7527 -2.0991 ENG 4.8124 *** 7.7664 0.0000 Analysis of Variance Source DF ss MS Regressi 3 413.1291 138.709 **** 0.00 on 7 Error 50 457.7607 2.2888 Total 53

MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
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Use statistical tables where applicable and solve.

Perform the F Test making sure to state the null and alternative hypothesis. 
Given an interpretation of the term “R-sq” and comment on its value. 

Beachcomber Ltd in a local car dealership that sells used and new vehicles. The manager of the
company wants to know how different variables affect the sales of his vehicles. A random sample of
yearly data was taken with the view to testing the model:
SALES=a+BAGE+YMIL+8ENG
Where SALES= amount that a vehicle is sold for($000's), AGE = age of the vehicle, MIL= the total
mileage of the vehicle at the point of sale and ENG = the size of the engine. The sample of data was
processed using MINITAB and the following is an extract of the output obtained:
The regression equation is *****
Coef
StDev
t-ratio
p-value
Predict
or
Constan
1.7586
0.2525
6.9648
0.0000
t
AGE
0.2124
0.3175
0.5042
MIL
-0.7527
0.3586
-2.0991
**
ENG
4.8124
***
7.7664
0.0000
Analysis of Variance
Source
DF
MS
Regressi
3
413.1291
138.709
****
0.00
on
7
Error
50
457.7607
2.2888
Total
53
Transcribed Image Text:Beachcomber Ltd in a local car dealership that sells used and new vehicles. The manager of the company wants to know how different variables affect the sales of his vehicles. A random sample of yearly data was taken with the view to testing the model: SALES=a+BAGE+YMIL+8ENG Where SALES= amount that a vehicle is sold for($000's), AGE = age of the vehicle, MIL= the total mileage of the vehicle at the point of sale and ENG = the size of the engine. The sample of data was processed using MINITAB and the following is an extract of the output obtained: The regression equation is ***** Coef StDev t-ratio p-value Predict or Constan 1.7586 0.2525 6.9648 0.0000 t AGE 0.2124 0.3175 0.5042 MIL -0.7527 0.3586 -2.0991 ** ENG 4.8124 *** 7.7664 0.0000 Analysis of Variance Source DF MS Regressi 3 413.1291 138.709 **** 0.00 on 7 Error 50 457.7607 2.2888 Total 53
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