Drill lifetime: A sample of 50 drills had a mean lifetime of 12.69 holes drilled when drilling a low-carbon steel. Assume the population standard deviation is 6.93. Part: 0/3 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. The confidence interval is

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
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ISBN:9780079039897
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Chapter10: Statistics
Section10.5: Comparing Sets Of Data
Problem 13PPS
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Drill lifetime: A sample of 50 drills had a mean lifetime of 12.69 holes drilled when drilling a low-carbon steel. Assume the population standard deviation is
6.93.
Part: 0 /3
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.
The confidence interval is
Transcribed Image Text:Drill lifetime: A sample of 50 drills had a mean lifetime of 12.69 holes drilled when drilling a low-carbon steel. Assume the population standard deviation is 6.93. Part: 0 /3 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. The confidence interval is
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