Question

A polymer-coated nylon weave is aged by exposing it to 158 degrees F for 168 hours. The tensile strength of the specimens of this material is measured before and after the aging process.

(a) Is there evidence to support the claim that the nylon weave tensile strength is the same before and after the aging process? Be sure to state Hypotheses clearly, give all summary data, state Test used, show Test Statistics formula and value, and show how to find the P-value. Write an appropriate conclusion using α = 0.01. 5

(b) Show all steps (including how to find cutoff value) and construct a two-sided 98% Confidence Interval for the true mean difference.

Before	After
215	203
226	216
226	217
219	211
222	215
231	218
234	224
219	210
209	201
216	207

Answer 1