Know your population size. The z-score is the number of standard deviations a given proportion is away from the mean. Then we pick a choice or response 5005 and the confidence interval 005 5 using the formula below.
Confidence Interval Confidence Level.
The confidence interval also called margin of error is the plus-or-minus figure usually reported in newspaper or television opinion poll results. The 99 confidence level 2 To put it more precisely. Next determine the critical value of the normal distribution at the required confidence level. How many people are you talking about in total.