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 500 hours.

a. Find the margin of error E for a 95% confidence interval. (5 points)

Round your answer to the nearest hundredths. . (References:

definition of margin of error on page 312 and example 2 on

page 312).

b. Construct a 95% confidence interval for the mean life, of all Twinkle bulbs. (5 points) (References: example 5 page 315, end of section exercises 51 - 56 pages 319 - 320)

a. Find the margin of error E for a 95% confidence interval. (5 points)

Round your answer to the nearest hundredths. . (References:

definition of margin of error on page 312 and example 2 on

page 312).

b. Construct a 95% confidence interval for the mean life, of all Twinkle bulbs. (5 points) (References: example 5 page 315, end of section exercises 51 - 56 pages 319 - 320)

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