question archive A small component in an electronic device has two small holes where another tiny part is fitted
A small component in an electronic device has two small holes where another tiny part is fitted
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A small component in an electronic device has two small holes where another tiny part is fitted. In the manufacturing process the average distance between the two holes must be tightly controlled at 0.02 mm, else many units would be defective and wasted. Many times throughout the day quality control engineers take a small sample of the components from the production line, measure the distance between the two holes, and make adjustments if needed. Suppose at one time four units are taken and the and the average distance between the two holes was 0.02075 with a standard deviation of 0.00171.
Required:
Determine, at the 1% level of significance, if there is sufficient evidence in the sample to conclude that an adjustment is needed. Assume the distances of interest are normally distributed.
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