![]() Step 2: Square both standard deviations to get the variances. If you are given variances to compare, go to Step 3. Step 1: If you are given standard deviations, go to Step 2. You’re much better off using technology (like Excel - see below). Warning: F tests can get really tedious to calculate by hand, especially if you have to calculate the variances. Need help with a specific question? Check out our tutoring page! This helps to avoid the possibility of Type I errors.īack to Top F Test to compare two variances by hand: Steps
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