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Sample Proportion or Sample mean? N >30 and is known N >30 Gather more data! n z x σ µ . ± = n p p p x ) ˆ 1 ( ˆ ˆ − ± =
n s t x . ± = µ
Yes for both No for one
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*: in case n is large, but you don’t have because , you use , however your t will be very close to z. **: in case you have but your N is small, you need to use t, but you may follow: n s t x . ± = µ n t x σ µ . ± = ' ''"'"%"