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( a ) Construct a 9 5 % confidence interval for the mean lifetime of this type of drill. Use tables or technology. Round your
a Construct a confidence interval for the mean lifetime of this type of drill. Use tables or technology. Round your answers to at least two decimal places. The confidence interval is b The manufacturer of the drills claims that the mean lifetime is greater than Does this confidence interval contradict this claim? Choose One YesNo the confidence interval contains some does not contain any values greater than so the claim is is not contradicted. c How large would the sample need to be so that a confidence interval would have a margin of error of
The sample size would need to be:
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