AP Statisticsmediummcq1 pt
A poll's interval is 0.48 to 0.52 at 95 percent confidence with n = 2500. Doubling n roughly
A.shrinks the margin by a factor of root 2
B.doubles the margin
C.halves the margin exactly
D.leaves the margin unchanged
Explanation
Core Concept
The margin scales with one over root n.
Correct Answer
Ashrinks the margin by a factor of root 2
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