Express the confidence interval 0111 p 0777 in the form pE

Express the confidence interval 0.111< p < 0.777 in the form p±E.

p±E= (__)+ or=(__)

Solution

E = (0.777-0.111)/2 = 0.333

hence p-E =0.111(l0wer limit)

implies p = 0.333+0.111=0.444

Hence confidence interval can be expressed as p±E= (0.444-0.333, 0.444+0.333) = (0.111,0.777)