Question #8 (10 points - a.) 6 points b.) 2 points c.) 2 points ) Nancy is a waitress at Seventh Heaven Hamburgers. She wants to estimate the average amount each table leaves for a tip. A random sample of 5 groups was taken and the amount they left for a tip (in dollars) is listed below: $12.00 $7.00 $5.00 $4.00 $7.00 a.) Find a 90% confidence interval for the average amount left by all groups. (*round to the nearest cent*) b.) If the sample size were larger, with everything else remaining the same, would the margin of Error increase or decrease? O Decrease O Increase c.) If the Confidence level were 95% instead of 90%, would the range (size) of the Confidence Interval be larger or smaller? O Smaller O Larger