Answered: A consumer buying cooperative tested…

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 consumer buying cooperative tested the effective heating area of 20 different electric space heaters with different wattages. Here are the results.

	Wattage	Area
1	750	291
2	1750	83
3	1250	215
4	1750	209
5	1500	295
6	750	153
7	1000	40
8	750	166
9	1250	115
10	1250	146
11	750	113
12	1000	56
13	1750	284
14	1000	45
15	750	82
16	1250	175
17	750	150
18	1500	231
19	1000	87
20	750	52

A. Compute the correlation between the wattage and heating area. Is there a direct or an indirect relationship? (Round your answer to 3 decimal places.)

B. Conduct a test of hypothesis to determine if it is reasonable that the
coefficient is greater than zero. Use the .05 significance level. (Round your
answer to 3 decimal places.)

C. Develop the regression equation for effective heating based on wattage. (Round
your answer to 3 decimal places.)

D. Which heater looks like the “best buy” based on the size of the residual?

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