Answer:
At the 95% confidence level, management should not conclude that the percentage of rework for electrical components is lower than the rate of 12% for non-electrical components, since the upper bound of the confidene interval, which is 0.1339, is higher than 0.12.
Step-by-step explanation:
To reach a conclusion, we have to observe the confidence interval.
Should management conclude that the percentage of rework for electrical components is lower than the rate of 12% for non-electrical components?
Is the upper bound of the confidence interval lower than 12% = 0.12?
If yes, it should conclude that this percentage is lower.
Otherwise, it cannot conclude.
Confidence interval:
0.0758 to 0.1339
0.1339 is higher than 0.12.
So.
At the 95% confidence level, management should not conclude that the percentage of rework for electrical components is lower than the rate of 12% for non-electrical components, since the upper bound of the confidene interval, which is 0.1339, is higher than 0.12.
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