The life in hours of a 75-watt light bulb is known to be normally distributed with o = 24 hours. A random sample of 20 bulbs has a meal life of 1012 hours. Suppose that we wanted the total width of the two-sided confidence interval on mean life to be six hours at 95% confidence. What sample size should be used? Round up the answer to the nearest integer. i Statistical Tables and Chart
The life in hours of a 75-watt light bulb is known to be normally distributed with o = 24 hours. A random sample of 20 bulbs has a meal life of 1012 hours. Suppose that we wanted the total width of the two-sided confidence interval on mean life to be six hours at 95% confidence. What sample size should be used? Round up the answer to the nearest integer. i Statistical Tables and Chart
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![The life in hours of a 75-watt light bulb is known to be normally distributed with σ = 24 hours. A random sample of 20 bulbs has a mean life of \( \bar{x} = 1012 \) hours.
Suppose that we wanted the total width of the two-sided confidence interval on mean life to be six hours at 95% confidence. What sample size should be used? Round up the answer to the nearest integer.
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Transcribed Image Text:The life in hours of a 75-watt light bulb is known to be normally distributed with σ = 24 hours. A random sample of 20 bulbs has a mean life of \( \bar{x} = 1012 \) hours.
Suppose that we wanted the total width of the two-sided confidence interval on mean life to be six hours at 95% confidence. What sample size should be used? Round up the answer to the nearest integer.
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Statistical Tables and Charts
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Step 1
Sample size (n)=20
Sample mean =1012 hours
Population standard deviation(σ)=24 hours
Width =6
Suppose that we wanted the total width of the two-sided confidence interval on mean life to be six hours at 95% confidence.
What sample size should be used?
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