MATH 1342 Lab 7 F11

# MATH 1342 Lab 7 F11 - MATH1342 Collin County College...

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MATH1342 PROJECT (LAB) 7 (CH 9) NAME: ________________ Collin County College Fall 2011 Instructor: Daryl Rupp DUE DATE: 11/3/2011 Part I Earlier we found that the sample mean score of the grades from Second Period classes was 88.1 and the SAMPLE Std. Dev. of 10.8. If we consider the class as a sample of size 26, find the following: 1. Write the equation for the Margin of Error (without values): 2. Write the keystrokes for finding the Confidence Interval for a Mean with unknown POPULATION Std. Dev.: 3. If you were constructing a 95% confidence level, what would be the critical value (t α/2 ) used? 4. Find the 95% Margin of Error (Round to two decimal places): 5. What is the 95% confidence interval for this sample mean? (Round to two decimal places) 6. If you were constructing an 80% confidence level, what would be the critical value (t α/2 ) used? 7. Find the 80% margin of error (Round to two decimal places): 8. What is the 80% confidence interval for this sample mean? (Round to two decimal places) 9. Which is wider, the 95% C.I. or the 80% C.I.? Explain why that makes sense.

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