Question

Assignment 8

In this assignment you will practice calculating correlations and regressions. These are a little different than what we have done in the previous labs. In this lab we are using continuous variables. Correlations and regressions are some of the most common types of statistical procedures. There are countless variations of the regression based model, but they all attempt to accomplish the same thing: prediction. This assignment will help you get the basics. You should use the two lab example documents and the PowerPoint to help with this assignment.

CORRELATION – Chapter 11

1. A researcher was interested in whether there was a relationship between stress and depression scores obtained from emergency health care providers. The data from 10 emergency workers are below.

Stress	Depression
38	26
28	16
42	34
18	22
26	15
45	24
32	18
26	18
22	12
33	15

Stress M = 31 , SD = 8.25

Depression M = 20, SD = 6.24

1. By hand, calculate the correlation coefficient. You are given the mean and standard deviation already, so you do not need to do that step. You also do not need to test the statistical significance – simply calculate the value of the correlation coefficient, r. You can use the table provided below to help. I included a few answers to help get you started.

Stress	Zx		Depression	Zy		ZxZy
38	(38-31)/8.25=	.85	26	(26-20)/6.24=	.96	.82
28			16
42			34
18			22
26			15
45			24
32			18
26			18
22			12
33			15
					Sum =

2. Using SPSS, enter the data and calculate the correlation coefficient and statistical significance. Report the results in APA style. Save this data set because you will be using it for question 3.

Answer 1

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