Answered: (a) Use an appropriate computer program…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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(a) Use an appropriate computer program to fit a
plane to the following data relating the monthly water

usage of a production plant (gallons) to its monthly pro-
duction (tons), mean monthly ambient temperature (◦F),

and the monthly number of days of plant operation over
a period of 12 months.

Mean Days of
Water usage Production temperature operation
y x1 x2 x3
2,228 98.5 67.4 19
2,609 108.2 70.3 20
3,088 109.6 82.1 21
2,378 101.0 69.2 21
1,980 83.3 64.5 19
1,717 70.0 63.7 21
2,723 144.7 58.0 19
2,031 84.4 58.1 20
1,902 97.4 36.6 17
1,721 131.8 49.6 23
2,254 82.1 44.3 18
2,522 64.5 44.1 19
(b) Estimate the water usage of the plant during a month

when its production is 90.0 tons, the mean ambient tem-
perature is 65◦F, and it operates for 20 days.

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