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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: $13.00 $7.00 $5.00 $3.00 $12.00 a.) Find a 90% confidence interval for the average amount left by all groups. (*round to the nearest cent*) $ < \mu < $ b.) If the sample size were larger, with everything else remaining the same, would the margin of Error increase or decrease? Increase Decrease c.) If the Confidence level were 95% instead of 90%, would the range (size) of the Confidence Interval be larger or smaller? Smaller Larger