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How large would the sample size have to be to cut the

A survey was conducted of the age? (in years) of 40 randomly selected customers. The mean was 28.56 and the standard deviation was 10.38

?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 20

?a) The new sample size should be

b) The new sample size should be

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