A machine produces metal rods used in an automobile suspension system. a random sample of 15 rods is selected, and the diameter is measured. the resulting data (in millimeters) are as follows: 8.24 8.25 8.20 8.23 8.24 8.21 8.26 8.26
a. 20 8.25 8.23 8.23 8.19 8.28 8.24 (a) calculate a 99% two-sided confidence interval on mean rod diameter.
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