A researcher conducted an experiment to test the effects of running 3 different types of gasoline with 3 possible types of additive on the mileage obtained. The experiment assumed that there is an interaction between gasoline type and the type of additive, hence, a two-factor ANOVA was employed in the data analysis. It was decided to run 36 motors – 4 in each factor level combinations. The following are the analysis results MEAN ADDITIVE 1 ADDITIVE 2 ADDITIVE 3 GAS TYPE 1 125.825 130.775 128.275 128.2917 GAS TYPE 2 127 133.6 137.825 132.8083 GAS TYPE 3 126.35 132.5 123 127.2833 126.3917 132.2917 129.7 129.4611 Analysis of Variance Table Df Sum Sq Mean Sq F Value Pr(>F) factor(gas.type) 2 207.7706 103.8853 11.08482 0.000306 factor(additive) 2 209.8872 104.9436 11.19775 0.000287 factor(gas.type):factor(additive) 4 262.9678 65.74194 7.01483 0.000523 Residuals 27 253.04 9.371852 NA NA a.) Is there a significant interaction between the type of gasoline and the type of additive? Why? b.) What does the result on the test for significant interaction imply? c.) Say you are to choose between the three gasoline types, regardless of the type of additive used and considering all other factors constant. Which gasoline would you prefer for your motor and why?

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 researcher conducted an experiment to test the effects of running 3 different types of gasoline with 3 possible types of additive on the mileage obtained. The experiment assumed that there is an interaction between gasoline type and the type of additive,
hence, a two-factor ANOVA was employed in the data analysis. It was decided to run 36 motors – 4 in each factor level combinations. The following are the analysis results

MEAN

	ADDITIVE 1	ADDITIVE 2	ADDITIVE 3
GAS TYPE 1	125.825	130.775	128.275	128.2917
GAS TYPE 2	127	133.6	137.825	132.8083
GAS TYPE 3	126.35	132.5	123	127.2833
	126.3917	132.2917	129.7	129.4611

Analysis of Variance Table

	Df	Sum Sq	Mean Sq	F Value	Pr(>F)
factor(gas.type)	2	207.7706	103.8853	11.08482	0.000306
factor(additive)	2	209.8872	104.9436	11.19775	0.000287
factor(gas.type):factor(additive)	4	262.9678	65.74194	7.01483	0.000523
Residuals	27	253.04	9.371852	NA	NA

a.) Is there a significant interaction between the type of gasoline and the type of additive? Why?
b.) What does the result on the test for significant interaction imply?
c.) Say you are to choose between the three gasoline types, regardless of the type of additive used and considering all other factors constant. Which gasoline would you prefer for your motor and why?

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