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You want to design a study for the proportion of adults who agree with this statement: "Do you think this coin will land on tails when I flip it?". You will use a $95\%$ confidence interval, and you want the margin of error to be $.05$ or less.

What is the minimum sample size that is required for those conditions?

A

$4$

B

$20$

C

$39$

D

$385$

E

$770$

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