Express the confidence interval (79.7%,87.5%)(79.7%,87.5%) in the form of ˆp±Ep^±E.

Question

Express the confidence interval (79.7%,87.5%)(79.7%,87.5%) in the form of ˆp±Ep^±E.

% ±± %

Answer 1

79.7 + 87.5 = 167.2

167.2/2 = 83.6

87.5-83.6 = 3.9

83.6 +/- 3.9

Answer 2

Find the midpoint of the interval is p

(79.7+87.5)/2=83.6

Next, the error term E is the distance from p to the end of the interval.

E=87.5-83.6=3.9

Therefore 83.6-3.9 and thg ge upper interval is 83.6+3.9