Express the confidence interval 0222

Express the confidence interval 0.222 <p <0.666 in the form p±E.

Solution

The mean of 0.222 and 0.666 is: (0.222+0.666)/2=0.444

The difference between the mean value p and the lower value is 0.444-0.222=0.222

The difference between the mean value and the upper value is: 0.666-0.444=0.222

Thus, 0.222 is error E.

Thus the answer is 0.444 plus minus 0.222