To do that, I'm going to come back here to StatCrunch, and I'm going to go to Stat -> Variance Stats (because that's how we calculate anything with standard deviation inside the StatCrunch application) -> One Sample (because I have only one sample) -> With Summary (because I don't have actual data). Fantastic!Īnd now the last part asks for a confidence interval estimate on the population standard deviation. And I'm asked around to three decimal places. The one on the left (which is the subscript L) is the one we want first. So I put 99% in, I press Compute, and here we've got our two critical values. So what we need to put in here is the area in between the critical values, and that's the size of the confidence level, which in this case is 99%. Here in these spaces are where our critical values are going to show up. Degrees of freedom are what we calculated in the first part. There are two that we're looking for, and so I'm going to have to use the Between option. So I know I need the Chi-squared distribution. ![]() I know I need the chi-squared calculator because, if I look here at the statistic I'm being asked to calculate, this is chi-squared. ![]() ![]() So to access the distribution calculator, I need to go to Stat -> Calculators -> Chi-squared. Let's pop that window out, and let's resize it so we can get a better look at what's going on here. To get the critical values out, I'm going to load up StatCrunch and access the distribution calculator that is to be found inside StatCrunch. The one on the left is what's being asked for here. Now the next part asks us for the first of two critical values.
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