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!