![]() So to get the actual area of the tails, I’m going to take my calculator here and I'm going to subtract 1 from this number - or rather this number from 1. So all I need to do here is stick in my z-score on the left, z-score on the right, hit Compute!, and this is the area in between the tails. ![]() This z-score is actually bounding the area of the tails, which is the P-value that we’re looking for. The area that’s going to come out of the calculators is going to be the area between the tails, but that’s OK we can just take the complement to get the area of the tails. So now I’m going to get - I want the area for my tails. So I’m going to select the Between option. And I want the standard Normal distribution, and that’s the default here in the calculator, so I don't need to adjust the mean and standard deviation.īut I do need to select this Between option here because we do have a two-tailed test. So here in StatCrunch, I go to Stat –> Calculators –> Normal. ![]() You can use the z-score tables if you want - you’ve got the links here to that in your problem - but I find it's much easier to just use StatCrunch. To get the P-value, I’m going to go back to StatCrunch and call up the Normal calculator.
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