#PAIRED Z TEST MINITAB 18 FOR N=30 PLUS#

So we're looking for 0.10 area in the two tails and that gives us 1.761 So now we can just plug these numbers into our confidence, interval the equation. So Alfa is one minus 0.9, which is 0.10 And if we go to a tea table to look this up, degrees of freedom is 14. So in her case, Alfa, the confidence interval is 90% confidence interval. So this time and two is 15 so that will be the smaller value so and to minus one is equal to 14 so the critical value. So the only parameter left to find is the critical value, and the first step is to determine the degrees of freedom when you're calculating manually, as we're doing now, degrees of freedoms estimated by the smaller of N one minus one or an to minus one. We have the sample variances and we have the sample sizes. So that's that's our confidence interval and as you may have noticed, we already have sample averages.

#PAIRED Z TEST MINITAB 18 FOR N=30 PLUS#

Times the square root of sample variance for a sample, one over the size of sample one plus the sample variance, for example to over the size of sample too.

Given the following information for two independent randomly selected samples and were asked to provide and 90% confidence interval for the difference between two means now a 90% confidence interval where the difference between two means is written as or estimated as the difference between the sample means plus or minus the critical value.

Paired z-test minitab 18 for n=30