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. Repeat steps one and 2 for all of the cases
4. Add up all the numbers in the (X-MEAN)²column
5. Divide this number by N-1
6. Calculate the square route of that number.

What is the SD of age in this sample? ________________

What does the standard deviation tell you about the dispersion of ages in this sample?

section 2:

Now, assume client 5 drops out of the group. Calculate the mean and standard deviation again. You can use the chart below if it's easier.

What is the new mean age?__________ What is the new standard deviation? ____________

What differences (if any) do you notice between the original and new values of mean and SD age?

Case #	X	X-MEAN	(X-MEAN)2
		(X-MEAN)2=

please explain and walk me through section 2 and how you get the answers