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Calculate a two-sided confidence inerval on mean roddiameter

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Reference no: EM132848918

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.

Reference no: EM132848918

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