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99 Confidence Interval Formula. Therefore the larger the confidence level the larger the interval. Construct a 98 confidence interval to estimate the mean commute time in the population of all Atlanta residents. Use the formula for 95 confidence level. However other confidence levels are also used such as 90 and 99 confidence levels.
X Zα2 σ n Where. 7421 - Video Example. The 95 confidence interval for this example is between 76 and 84. The Confidence Interval is based on Mean and Standard Deviation. Thus the formula to find CI is. The range of a confidence interval is higher for a higher confidence level.
However if you use 95 its critical value is 196 and because fewer of the intervals need to capture the true meanproportion the interval is less wide.
Examples of Confidence Interval Formula. When calculated this formula gives the researchers the result of 86 179 as their confidence interval. However the confidence level of 90 and 95 are also used in few confidence interval examples. Confidence Interval 330 258 05 100 to 330 258 05 100 Confidence Interval 317 to 343. The dataset is titled Atlanta Commute. This example uses a dataset is built in to StatKey.