Answer to Question #231731 in Statistics and Probability for Fairy

Question

1.3 A certain polymer is used for evacuation systems

for aircraft. It is important that the polymer be re- (a) sistant to the aging process. Twenty specimens of the polymer were used in an experiment. Ten were as- (b) signed randomly to be exposed to an accelerated batch aging process that involved exposure to high tempera- tures for 10 days. Measurements of tensile strength of

the specimens were made, and the following data were recorded on tensile strength in psi:

12 37 5 3 3

No aging: 227 222 218 216 Aging: 219 214 218 203

218 217 229 228 215 211 204 201

225

221

209

205

(a) Do a dot plot of the data.

From your plot, does it appear as if

cess has had an effect on the tensile strength of this polymer? Explain

c) Calculate the sample mean tensile strength of the two samples.

(d) Calculate the median for both. Discuss the simi- larity or lack of similarity between the mean and median of each group.