The purpose of the study The Incorporation of a. Chelating Agent into a Flame Retardant Finish of

Question:

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 the Virginia Polytechnic Institute and State University was to evaluate: the use of a chelating agent as part of the flame-retardant finish of cotton flannelette by determining its effects upon flammability after the fabric is laundered under specific conditions. Two baths were prepared, one with carboxymethyl cellulose and one without. Twelve pieces of fabric were laundered 5 times in bath I, and 12 other pieces of fabric were laundered 10 times in bath I. This was repeated using 24 additional pieces of cloth in bath II. After the washings the lengths of fabric: that burned and the burn times were measured. For convenience, let us define the following treatments:

Treatment 1: 5 launderings in bath I,

Treatment 2: 5 launderings in bath II,

Treatment 3: 10 launderings in bath I,

Treatment 4: 10 launderings in bath II

Burn times, in seconds, were recorded as follows:

(a) Perform an analysis of variance using a 0.01 level of significance and determine whether there are any significant differences among the treatment means.

(b) Use single-degree-of-freedom contrasts with a = 0.01 to compare the mean burn time of treatment 1 versus treatment 2 and also treatment 3 versus treatment4.