(Answered) Part variability is critical in the manufacturing of ball

Statistics

Part variability is critical in the manufacturing of ball bearings. Large variances in the size of the ball bearings cause bearing failure and rapid wear out. Production standards call for a maximum variance of .0001 when the bearing sizes are measured in inches. A sample of 15 bearings shows a standard deviation of 0.014 inches. Use a level of significance of 3% to determine whether the sample indicates that the maximum acceptable variance is being exceeded.

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