The Federal Aviation Administration requires material used to make evacuation systems retain their strength over the life of the aircraft. In an accelerated life test, the principal material, polymer-coated nylon weave, is aged by exposing it to 158 F for 168 hours. The tensile strength of the specimens of this material is measured before and after the aging process. The following data (in psi) are recorded:

Specimen Original Aged
1 215 203
6 231 218
2 226 216
7 234 224
3 226 217
8 219 210
4 219 211
9 209 201
5 222 215
10 216 207

(a) Is there evidence to support the claim that the nylon weave tensile strength is the same before and after the aging process?