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Calcula&ng SD for real people: Step 1: Find the mean Step 2: Subtract the mean from each raw score. (Some of your results will be nega&ve numbers.) Step 3: Square each number in Step 2. (mul&ply each number by itself. Remember: two nega&ves make a posi&ve) Step 4: Find the mean of the numbers from Step 3.(This is call the variance. Now you have more jargon to impress people.) Step 5: Take the square root of the result in Step 4. (This is the SD.)