Answer to Question #323719 in Statistics and Probability for Sheelah

Question

Confidence level=97%

Answer 1

Confidence interval has a two tail to obtain the area of one tail we subtract 0.97 from 1 to obtain 0.03 then divide by two .Thus we obtain one tail area as 0.015 Using the standard normal table the corresponding z value to an area of 0.015 is -2.17. Thus the confidence coefficient is 2.17.