Question

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.

Answer #1

**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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