To ensure that your results are valid, consider the following guidelines when you collect data, perform the analysis, and interpret your results.
- The data should be continuous
- If you have categorical data, you should perform Cross Tabulation and Chi-Square to examine the association between variables.
- The relationship between the variables should be linear
- If the variables have a nonlinear relationship, your results may be misleading. To check for nonlinear relationships graphically, use Scatterplot or Fitted Line Plot.