Monday, November 15, 2010

Chapter 8 Q1 Q2

Chapter 8 Q1

We are told the population standard deviation, so we can use normdist...or calculate by hand!

Chapter 8 Q2

The little graphics below shows how to calculate the 95% interval by hand. In Excel first find the Margin of Error:

a. =confidence(0.1, 6,50) = 1.396

b. =confidence (0.05,6,50) = 1.67

c. = confidence (0.01,6,50) = 2.19

THEN find the Confidence Interval by adding and subtracting from the mean (which is given at 32)...don't forget this part!

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