Homework Answers
Ans:
population proportion=0.5
n=200
standard error of p-hat=sqrt(0.5*(1-0.5)/200)=0.0354
a)
z(0.5)=0
z(0.60)=(0.60-0.50)/0.0354=2.82
P(0<z<2.82)=P(z<2.82)-P(z<0)
=0.9976-0.5=0.4976
b)
lower limit=0.5-1.645*0.0354=0.442
upper limit=0.5+1.645*0.0354=0.558
c)
z=(0.55-0.5)/0.0354
z=1.414
P(z>1.414)=0.0786
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