sec-9-3-worksheet.pdf

# Question 13 to find a scores deviation from the mean

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Question (13): To find a score’s deviation from the mean , you simply subtract the mean from the score. The deviation may be positive, or it may be negative. Use this information to fill in the first three columns of the table on the following page. Question (14): Square each of the terms in the Deviation column of your table from question (13) to fill out the last column of the table. Add all of these squares and divide by the the size of the data set (28). This is called the population variance ( σ 2 ). Take the square root of the population variance. This is called the population standard deviation ( σ ). Question (15): How does finding the sample variance and sample standard deviation differ from finding the population variance and population standard deviation you found in question (14)? In your own words, tell why the book says this change was made.

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Data Point Formula for Deviation Deviation from Mean Deviation 2 565 522 598 570 546 338 634 604 482 518 622 392 634 270 537 513 555 412 613 559 519 538 577 611 538 563 551 492 575 621 653 596 Total: σ 2 = σ =
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