Respuesta :
Interval at 95% confidence = p+/- Z sqrt (p(1-p)/n)
Upper interval => 0.68=p+1.96 sqrt (p(1-p)/n)
Lower interval => 0.52=p-1.96 sqrt (p(1-p)/n)
Putting sqrt term to be "q"
0.68=p+1.96q
0.52=p-1.96q
Adding the two equations to solve for p (proportion of 150 adults rootng for North high school);
1.2 = 2p => p=0.6
Upper interval => 0.68=p+1.96 sqrt (p(1-p)/n)
Lower interval => 0.52=p-1.96 sqrt (p(1-p)/n)
Putting sqrt term to be "q"
0.68=p+1.96q
0.52=p-1.96q
Adding the two equations to solve for p (proportion of 150 adults rootng for North high school);
1.2 = 2p => p=0.6