After conducting a survey,a researcher wishes to cut the standard error (and thus the margin of error)to
Of its original value.How will the necessary sample size change?

Question

After conducting a survey,a researcher wishes to cut the standard error (and thus the margin of error)to 
Of its original value.How will the necessary sample size change?

Quizplus · Accepted Answer

The standard error is proportional to the inverse square root of the sample size. To cut the standard error by a factor of 3, we need to increase the sample size by a factor of 9 (i.e., 3 squared).

After Conducting a Survey,a Researcher Wishes to Cut the Standard