Finding Margin of error and Confidence Interval
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Find the critical value Zc necessary to form a confidence interval at the given level of confidence.
The new Twinkle bulb has a mean life of hours with a standard deviation Q = 35 hours. A random sample of 50 light bulbs is selected from inventory. The sample mean was found to be X(with a line above X) 500 hours.
a.Find the margin of error E for a 95% confidence interval =
(Round your answer to the nearest hundredths.)
b.Construct a 95% confidence interval for the mean life, u of all Twinkle bulbs =
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Solution Summary
The expert finds the critical value necessary to form a confidence interval at a given level of confidence.
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Solution:
Given s = 35 hours, n = 50
a.
Margin of error ...
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