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A machine produces metal rods used in an automobile suspensionsystem. A random sample of 15 rods is selected, and the diameter ismeasured. The resulting data (in millimeters) are as follows:
8.24 8.25 8.20 8.23 8.24
8.21 8.26 8.26 8.20 8.25
8.23 8.23 8.19 8.28 8.24
a) Check the assumption of normality for rod diameter.
b) Calculate a 95% two-sided confidence inerval on mean roddiameter.
c) Calculate a 95% upper confidence bound on the mean. Comparethis bound with the upper bound of the two-sided confidenceinterval and discuss why they are different.
probability values based on normal distribution.the sony corporation produces a walkman that requires two aa batteries.
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