When working with either the sample mean or the sample proportion, if we want the margin of error to be cut in half, we need to:
Select one:
a. Double the sample size.
b. Triple the sample size.
c. Quadruple the sample size.
d. Multiply n by 5.
Quadruple the sample size (c)
[ explanation:-
i am explaining the case of mean.
let us consider. the populations sd is , z critical value ,margin of error E.
the needed sample size was:-
when margin of error is halved, the needed sample size be:-
]
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