(c) How large would the sample need to be so that a 95% confidence interval would have a margin of error of 1.0? The sample size would need to be

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(c) How large would the sample need to be so that a 95% confidence interval would have a margin of error of 1.0?
The sample size would need to be
Transcribed Image Text:Part 3 of 3 (c) How large would the sample need to be so that a 95% confidence interval would have a margin of error of 1.0? The sample size would need to be
Drill lifetime: A sample of 50 drills had a mean lifetime of 12.05 holes drilled when drilling a low-carbon steel. Assume the population
standard deviation is 6.56 .
Part 1 of 3
(a) Construct a 95% confidence interval for the mean lifetime of this type of drill. Use tables or technology. Round your answers to
at least two decimal places.
CD-
The confidence interval is
Part 2 of 3
(b) The manufacturer of the drills claims that the mean lifetime is greater than 13. Does this confidence interval contradict this
claim?
(Choose one) ▼
the confidence interval (Choose one)
values greater than 13, so the
claim (Choose one) ▼ contradicted.
Transcribed Image Text:Drill lifetime: A sample of 50 drills had a mean lifetime of 12.05 holes drilled when drilling a low-carbon steel. Assume the population standard deviation is 6.56 . Part 1 of 3 (a) Construct a 95% confidence interval for the mean lifetime of this type of drill. Use tables or technology. Round your answers to at least two decimal places. CD- The confidence interval is Part 2 of 3 (b) The manufacturer of the drills claims that the mean lifetime is greater than 13. Does this confidence interval contradict this claim? (Choose one) ▼ the confidence interval (Choose one) values greater than 13, so the claim (Choose one) ▼ contradicted.
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