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a sample of 21 minivan electrical warranty repairs for "loose, not attached" wires (one of several...

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Basic Math

a sample of 21 minivan electrical warranty repairs for "loose,not attached" wires (one of several electrical failure categoriesthe dealership mechanic can select) showed a mean repair cost of$45.66 with a standard deviation of $27.79. (a) construct a 95percent confidence interval for the true mean repair cost. (b) Howcould the confidence interval be made narrower?

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Part aConfidence IntervalLower Limit Lower Limit 330101Upper Limit Upper Limit 58309995 Confidence    See Answer
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