Elizabeth.Marisol.MM207 Unit 6 Project Form 3 correction

# Elizabeth.Marisol.MM207 Unit 6 Project Form 3 correction -...

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MM207 Unit 6 Project Form 3 Total points are 40. Points are included with each problem. Included with each section or problem are reference examples and end of section  exercises that can be used as a guide. Be sure to show your work in case partial   credit is awarded. To receive full credit, work must be shown if applicable. Section 6.1: Confidence Intervals for the Mean (Large Samples) 1. Find the critical value z c  necessary to form a confidence interval at the  given level of confidence.  (References: definition for level of confidence  page 311, end of section exercises  5 – 8 page 317)  (2.5 points each) a. 90% a. 90% zc = 1.644853627= 1.645 b. 80% zc = 1.281551566 = 1.282 2. The new Twinkle bulb has a standard deviation of 35 hours. A random  sample of 50 light bulbs is selected from inventory. The sample mean was found  to be 550 hours.  a. What is the  margin of error  [E] for a 90% confidence interval?

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