A certain polymer is used for evacuation systems for aircraft. It is important that the polymer be resistant to the aging process. Twenty specimens of the polymer were used in an experiment. Ten were assigned randomly to be exposed to an accelerated batch aging process that involved exposure to high temperatures for 10 days. Measurements of tensile strength of the specimens were made, and the following data were recorded on tensile strength in psi: No aging: 227 222 218 217 225 218 216 229 228 221 Aging: 219 214 215 211 209 218 203 204 201 205 (a) Do a dot plot of the data. (b) From your plot, does it appear as if the aging process has had an effect on the tensile strength of this polymer? Explain. (c) Calculate the sample mean tensile strength of the two samples.
A certain polymer is used for evacuation systems for aircraft. It is important that the polymer be
resistant to the aging process. Twenty specimens of the polymer were used in an experiment. Ten were
assigned randomly to be exposed to an accelerated batch aging process that involved exposure to high
temperatures for 10 days. Measurements of tensile strength of the specimens were made, and the
following data were recorded on tensile strength in psi:
No aging: 227 222 218 217 225
218 216 229 228 221
Aging: 219 214 215 211 209
218 203 204 201 205
(a) Do a dot plot of the data.
(b) From your plot, does it appear as if the aging process 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 of each group.
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