Data Plotting & Visualization,Probability & Statistics for Engineers & Scientists Walpole, Solution

Exercise problem solution of Problem 1.3, Probability & Statistics for Engineers & Scientists by Walpole 9th edition Solution of exercise problems of Chap 1.
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.
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