Copy (2) of KatrinaManning2_MM207_Unit_6_Chapter_6_Project

Copy (2) of KatrinaManning2_MM207_Unit_6_Chapter_6_Project...

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MM207 Unit 6 Chapter 6 Project  Total points are 30. 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 on page 317)  (2 points each) a. 90%       1.645 b. 85%      1.440 2. The new Twinkle bulb has a standard deviation  34 = σ  hours. A random sample of 77  light bulbs is selected from inventory. The sample mean was found to be  = X 492 hours.  a. Find the margin of error E for a 90% confidence interval. (5 points)      Round your answer to the nearest hundredths.  (References:  
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This note was uploaded on 03/26/2011 for the course MM 207 taught by Professor Hill during the Spring '08 term at Kaplan University.

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Copy (2) of KatrinaManning2_MM207_Unit_6_Chapter_6_Project...

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