Nine measurements are taken on the strength of a certain metal. In order, they are 7.2, 8.9, 9.7, 10.5, 10.9, 11.7, 12.9, 13.9, 15.3, and these values correspond to the 10th, 20th, . . . , 90th percentiles of this sample. Construct a q–q plot of the measurements against the same percentiles of N(0, 1). Does it seem reasonable that the underlying distribution of strengths could be normal?
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