Question: In the weld data (Example 7.17) imagine that 95% confidence intervals are computed for the mean strength of welds with oxygen contents of 1.3, 1.5,

In the weld data (Example 7.17) imagine that 95% confidence intervals are computed for the mean strength of welds with oxygen contents of 1.3, 1.5, and 1.8 parts per thousand. Which of the confidence intervals would be the shortest? Which would be the longest?

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