HSD 425 -Lab - SD and Z scores

Computing Standard Deviation (SD)

section 1:

Case #	X	X-MEAN	(X-MEAN)2
1	34
2	35
3	39
4	42
5	18
6	33
7	34
8	33
9	35
10	37
		(X-MEAN)2=

Your objective is to calculate the mean, median, mode, and standard deviation for this variable (client age).

What is the mean age? What is the mode age? What is the median age?

_________________ __________________ ___________________

Next, using the table above, calculate the standard deviation. In plain English, follow these steps:

1. Starting with case 1, find the deviation score (X-MEAN) by subtracting the mean age from the raw age. Write the answer in the X-MEAN column.
2. Square that number, and write the value that you get into the (X-MEAN)²column
3. 

2 -x SD = N