a. n1=400 p1=.65 n2=400 p2=.58

b. n1=180 p1=.31 n2=250 p2=.25

c. n1=100 p1=.46 n2=120 p2=.61

someone please help and explain to me how this works!!! Much appreciated

95 % conidence interval :

95% Tabular value =1.96

p1-p2 - 1.96 *sqrt (p1*(1-p1)/n1+p2*(1-p2)/n2)

p1-p2 + 1.96 *sqrt (p1*(1-p1)/n1+p2*(1-p2)/n2)

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