Question 265995
11) The standard error of the sample mean is equal to 5 when n=25. If the sample size increases by a factor of four, how will the standard error change?
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E = t*s/sqrt(n)
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If sample size becomes 4n you get:
E = t*s/sqrt(4n) = ts/(2sqrt(n)) 
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Cross-multiply and you get 
2E = ts/sqrt(n)
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Answer: A
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Cheers,
Stan H.
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A.

It will double.
B.

It will be cut to ¼ of 5.
C.

It will quadruple.
D.

It will be cut in half.