aged white paint colorĮquation for 95 confidence interval answer For a 95% confidence interval we see that t * = 2.09. ![]() For our example, the smaller of the two samples is 20. We use the smaller of the two sample sizes, and then subtract one from this number. ![]() This may underestimate the number of degrees of freedom, but it is much easier to calculate than using Welch's formula.WebConfidence Intervals Since 95% of values fall within two standard deviations of the mean according to the 68-95-99.7 Rule, simply add and subtract two standard deviations from the mean in order to obtain the 95% confidence interval.
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