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how do you find the sample mean of a confidence interval. All you have to do is highlight CALCULATE and press ENTER. Where Z is the Z-value for the chosen confidence level X is the sample mean s is the standard deviation and n is the sample size.
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Decide the confidence interval that will be used. X S xi n Here x represents the sample mean S tells us to add xi refers to all the X-values and n stands for the number of items in the data set. The formula for confidence interval can be calculated by subtracting and adding the margin of error from and to the sample mean.
I can calculate the 95 confidence interval as follows.
This is the t- value for a 95 confidence interval for the mean with a sample size of 10. So our 99 confidence interval is 1116 1724. Here we want to calculate the smallest sample size we will need to create a 95 confidence interval CI with a margin of error E of 01. Assuming the following with a confidence level of 95.
