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Breaking Down Standard Deviation

NO

Nicole Oehmen

Transcript

Step 6: Obtain Standard Deviation!!

Step 1: Arrange the data from highest to lowest and turn apparent class intervals into real class intervals

Step 5: Find the Mean, square it, and subtract this number from the last step to obtain the variance

EXAMPLE

Variance Formula: Grouped Data

Breaking Down

Standard Deviation

Step 2: Find and square the midpoint of each interval

Step 4: Divide the obtained sum by N

Step 3: Multiply squared midpoints by frequency of each interval and sum

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