A survey of 25 randomly selected customers found the ages shown (in years). The mean is 32.48 years and the standard deviation is 9.60 years. 1) How would the confidence interval change if you had assumed that the population standard deviation was known to be 10.0 years? 42 34 47 31 20 40 29 45 27 38 29 33 49 37 31 41 33 29 12 15 34 39 20 36 21 1) What is the confidence interval using the given population standard deviation? Select the correct choice below and fill in the answer boxes within your choice. (Round to two decimal places as needed.) A. The new confidence interval (),() is wider than the interval from part a. B. The new confidence interval (),() is narrower than the interval from part a. The new confidence interval (nothing,nothing) is wider than the interval from part a. B