Homework Answers
We know that:
sample size, n= 250
sample proportion, p_hat= 87/250= 0.348
population proportion, p= 25%= 0.25
Z_stat= (p_hat-p) / sqrt(p(1-p)/n)
= (0.348-0.25)/ sqrt(0.25*0.75/250)
= 0.098 / 0.02738613
= 3.578454 or 3.58
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