Finding Sample Size With Confidence Interval And Margin Of Error. For example if you use a confidence interval of 4 and 47 percent of your sample picks an answer you can be sure. Let E represent the desired margin of error.
Heres a worked example assuming you chose a 95 confidence level 5 standard deviation and a margin of error confidence interval of - 5. That if you had asked the question of the entire relevant population between 43 47-4 and 51 474 would have picked that answer. The MOE is the margin of error that is desired.
N 1645 2 05 1 -.
The confidence interval also called margin of error is the plus-or-minus figure usually reported in newspaper or television opinion poll results. The confidence interval also called margin of error is the plus-or-minus figure usually reported in newspaper or television opinion poll results. N zcsE 2. Wider the confidence interval the higher the confidence level.
