Overview
This week, we are going to analyze the relationship between height and weight in our sample using the YBRSS data set we used before. In SPSS, please do the following:
- Get the mean and standard deviation for height and weight (use variable stheight and stweight). These are in meters and kilograms, so don't worry if the numbers look too low.
- Create 2 histograms: one for stweight and one for stheight
- Run a correlation for stweight and stheight
- Run a linear regression that predicts stweight based on stheight
- Create a scatter plot for this prediction (use simple scatter in the options)
Write up the results in APA format. You can use the template below. Replace brackets with the correct information. When reporting variables, be sure to use the regular name of the variable rather than the variable name in SPSS. For example, instead of saying stheight and stweight, just say height and weight. Please review the examples in module 5 to confirm that your results are formatted correctly.
Correlation:
[Variable 1] and [variable 2] were [strength] correlated, r([df]) = [r], p [=/< significance].
Regression:
[Variable 1] [significantly predicted/did not significantly predict] [Variable 2], b = [b], t(df) = [t-value], p [=/< p-value]. [Variable 1] also explained a significant proportion of variance in [variable 2], R2 = [R2 value], F(df, df) = [F statistic], p [=/< p-value].
Some tips- when you're in the choosing variables in an analysis or for a plot, if you right click the list of variables, you can change it to match the variable name. Otherwise, you'll need to check "variable view" to see which label you're looking for.
Here are the paths for correlation, regression, and the scatterplot with some notes:
- Correlation: Analyze > Correlate > Bivariate
- In here you will choose the two variables you are looking to correlate
- Regression: Analyze > Regression > Linear
- In here, make sure your dependent variable is our Y variable, and you will put your predictor variable in the part that says "block 1 of 1"
- Scatter plot: Graphs > Scatter/Dot (this is where you will choose Simple Scatter
- select define
- Put our Y variable on the Y axis and the X variable on the X axis. If it is flipped, I will take points off.
Note. I use a Mac, so these paths are correct for both Windows and iOS.