Solved: The purpose of the study The Incorporation of a

Chapter , Problem 9.15

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The purpose of the study The Incorporation of a Chelating Agent into a Flame Retardant Finish of a Cotton Flannelette and the Evaluation of Selected Fabric Properties, conducted at Virginia Tech, was to evaluate the use of a chelating agent as part of the flame retardant finish of cotton flannelette by determining its effect upon flammability after the fabric is laundered under specific conditions. There were two treatments at two levels. Two baths were prepared, one with carboxymethyl cellulose (bath I) and one without (bath II). Half of the fabric was laundered 5 times and half was laundered 10 times. There were 12 pieces of fabric in each bath/number of launderings combination. After the washings, the lengths of fabric that burned and the burn times were measured. Burn times (in seconds) were recorded as follows: Launderings Bath I Bath II 5 10 13.7 25.5 14.0 14.0 27.2 14.9 10.8 14.2 23.0 15.8 29.4 12.3 16.8 17.1 13.5 27.4 15.7 14.8 9.7 12.3 12.9 13.0 25.5 11.5 6.2 4.4 16.0 3.9 18.2 14.7 10.6 17.7 5.4 5.0 2.5 2.5 8.8 17.1 5.8 18.3 5.0 3.3 1.6 7.1 14.5 13.9 7.3 9.9 (a) Perform an analysis of variance. Is there a signifi- cant interaction term? (b) Are there main effect differences? Discuss.