SOLUTION: 2. The new Twinkle bulb has a standard deviation hours. A random sample of 50 light bulbs is selected from inventory. The sample mean was found to be 550 hours. a. Find the m

Question 324061: 2. The new Twinkle bulb has a standard deviation hours. A random sample of 50 light bulbs is selected from inventory. The sample mean was found to be 550 hours.
a. Find the margin of error E for a 90% confidence interval.
Round your answer to the nearest hundredths.
b. Construct a 90% confidence interval for the mean life,  of all Twinkle bulbs.
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
standard deviation is missing
Cheers,
Stan H.
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