Question: The void volume within a textile fabric affects comfort, flammability, and insulation properties. Permeability of a fabric refers to the accessibility of void space to

The void volume within a textile fabric affects

The void volume within a textile fabric affects comfort, flammability, and insulation properties. Permeability of a fabric refers to the accessibility of void space to the flow of a gas or liquid. The article "The Relationship Between Porosity and Air Permeability of Woven Textile Fabrics" gave summary information on air permeability for a number of different fabric types. Consider the following data on two different types of plain-weave fabric. Let's calculate the confidence interval for the difference between true average porosity for the cotton fabric and that for the acetate fabric (difference = Cotton - Triacetate). Fabric Type Cotton Triacetate Sample Size 8 13 Sample Mean 55.8 128 Sample Variance 1.12 12.95 a.[2pts] What is the degrees of freedom for this question? Submit Answer Tries 0/99 b.[3pts] The 90 % confidence interval for the difference between true average porosity for the cotton fabric and that for the acetate fabric is (keep 3 digits after decimal): Lower bound: Upper bound: Submit Answer Tries 0/99 c.[2pts] Based on the 90 % CI in part b, can you conclude that there is a significant difference between true average porosity for the cotton fabric and that for the acetate fabric? O Yes O No Submit Answer Tries 0/99

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