The document provides instructions for calculating the standard deviation from a set of test scores. It defines standard deviation as the square root of the sum of the squared differences between each score and the mean, divided by n-1. It then lists the steps to calculate standard deviation from a sample of 10 test scores, which are to be organized in a 3 column chart and used to determine the mean, differences from the mean, squared differences, sum of squares, and final standard deviation value.

1. Deviation
1

2. Using the data from the grade 10 test
12, 14, 4.5, 16, 22, 20, 11, 22, 19, 17
Calculate the mean: 15.75
You need a chart 3 Columns
11 Rows
2

3. 3

4. 2
x x ­ x ( x ­ x )
12
14
4.5
16
22
20
11
22
19
17
4

5. 2
x x ­ x ( x ­ x )
12
14
4.5
16
22
20
11
22
19
17
5

6. Difference between each score, and the mean
6

7. Determine the square of each of the differences
7

8. Determine the sum of the squares
8

9. Divide the sum of the squares by n­1
9

10. The standard deviation is the square root of this
number.
10

11. Standard Deviation Formula
Standard Deviation
** You don't have to
remember this formula, just
know how to calculate.**
11

12. `
Assignment Page V-F-14
Questions: 1 - 6
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