Practice Problems ANOVA Examples

# Practice Problems ANOVA Examples - ANOVA SS Among...

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ANOVA SS DF MS F Among Treatments 3 1.02 Error 4474.56 Total 5611.86 15 What is the sum of squares of sample mean about the grand mean? What is the variation of the individual measurements about their respective means? What is the critical value of F at 0.05 level? Is F significant at 0.05 level? SS DF MS F Among Treatments 4646.46 1.02 Error 12 234.63 Total 18 Is F significant at 0.05 level?

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Sample Exam Questions Use the information given in the paragraph below to answer the next eight questions. February 14, 2006, marked the 60th anniversary of ENIAC, the first computer in the world. In a Computerworld magazine interview, ENIAC’s inventor Pres Eckert explains how they chose the right type of wires back in 1946: “We only used wire that passed the mouse test”. They threw a number of wire samples in a cage full of hungry mice and let them eat the insulation, in order to determine which insulation type mice liked the least . ANOVA results with amounts of insulation (in mg) eaten by the mice are shown below. Test at the 0.05 level the claim that mice have different preferences among insulation types. Anova: Single Factor SUMMARY Groups Count Sum Average Variance Insulation1 11 456.00 41.45 54.87 Insulation2 11 480.00 43.64 46.25 Insulation3 11 366.00 33.27 62.42 ANOVA Source of Variation SS df MS F P-value F crit Between Groups 656.727 2 328.364 XXXX XXX XXXX Within Groups 1635.454 XX XXX
X Total 2292.182 XX X TUKEY MULTIPLE COMPARISON TEST Critical Q Distance Alpha xxx xxx 0.01 Means joined by a double line are not significantly different. Insulation2

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## This note was uploaded on 03/12/2011 for the course DSCI 2710 taught by Professor Hossain during the Spring '08 term at North Texas.

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Practice Problems ANOVA Examples - ANOVA SS Among...

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