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A survey of 25 randomly selected customers tound the ages shown (in years) The mean is 3236 years and the standard deViation is 10 34 years a) Construct a 80% condence interval for the mean age of all customers, assuming that the assumptions and conditions for the condence interval have been met b) How large is the margin of error'? :2) How would the condence Interval change if you had assumed that the standard devration was known to be 11 0 years? a) What is the condence interval? (,l (Round to two decimal places as needed ) b) What is the margin of error? The margin of error is (Round to two decimal places as needed.) c) What Is the condence Interval using the given population standard deviation? Select the correct choice below and ll in the answer boxes within your choice (Round to two decimal places as needed ) O A- The new condence interval( ) is narrower than the interval from part a O E- The new condence interval( , ) is wrderthan the interval from part a 49 37 23 4O 16 36 22 t 7 22 3 3 47 23 47 45 22 39 35 34 36 47 20 E1 38 30 30 2t