A survey was conducted of the age (in years) of 30 randomly selected customers. The mean was 28.27 years and the standard deviation was 10.69 years. a) How large would the sample size have to be to cut the margin of error in half? b) About how large would the sample size have to be to cut the margin of error by a factor of 10? a) The new sample size should be (Round up to the nearest integer.) b) The new sample size should be (Round up to the nearest integer.)