Confidence Interval

Question

Express the confidence interval  in the form of .

_______%  ________%

Answer 1

p =the mean, the midpoint, the average of 78.1 and 92.3

= (78.1+92.3)/2

= 170.4/2

= 85.2 = mean

mean plus or minus the margin of error

= 85.2 + 85.2-78.1

= 85.2 + 7.1