Wielkość próby i margines błędu przedziału z dla p

Jonah wants to make a one-sample $z$‍ interval using $99\mathrm{\%}$‍ confidence to estimate what proportion of silicon wafers at his factory are defective. He wants the margin of error to be no more than $3\mathrm{\%}$‍. A previous study suggests that about $6\mathrm{\%}$‍ of these wafers are defective.