33. What sample size would you need in order to increase the precision of your estimate by 15-fold? Mean 6.118 Variance-1.235 Standard Deviation-1.174 33. What sample size would you need in...

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Answer 1

Answer #1

We know that the sample size is inversely proportional to the square of effect size (or precision). The formula is:

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Hence, if the precision is changed from D to D/15 (precision improves or error decreases), The sample size needed to do the same is:

$N*D^{2} = N_{new}*(D/15)^{2}$

$N_{new} = 225*N$

Hence, the sample size needs to be increased 225 times the original sample size to increase the precision 15 folds.

Answer 2

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