The confidence level is the percentage of times you expect to get close to the same estimate if you run your experiment again or resample the pop...

To calculate the confidence interval , you need to know: The point estimate you are constructing the confidence interval for The critical values f...

The standard normal distribution , also called the z -distribution, is a special normal distribution where the mean is 0 and the standard de...

The z -score and t -score (aka z -value and t -value) show how many standard deviations away from the mean of the distribution you are, ass...

A critical value is the value of the test statistic which defines the upper and lower bounds of a confidence interval , or which defines the thr...

If your confidence interval for a difference between groups includes zero, that means that if you run your experiment again you have a good chanc...

If you want to calculate a confidence interval around the mean of data that is not normally distributed , you have two choices: Find a distribut...