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The critical dimension on a componenet is the width. 80 components were measured with the average width of 1.252 inches and variance of 0.0016 .

The critical dimension on a componenet is the width. 80 components were measured with the average width of 1.252 inches and variance of 0.0016. What is the 99% confidence interval for the true diamter of the process?

Group of answer choices

[1.245, 1.260]

[1.241, 1.264]

[1.252, 1.253]

[1.239, 1.266]

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