Question: I am testing the hypotheses that two variances are equal and using alpha = 0.05. However, I am not sure why do we need to

I am testing the hypotheses that two variances are equal and using alpha = 0.05. However, I am not sure why do we need to use 0.975 to calculate F statistic. And also don't know why F0.975 = 1/F0.025.

Does anyone could explain this?

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