Learn the difference between Pearson’s Correlation and Spearman’s Rank Correlation — what they are, when to use each method, and how to choose based on data type and distribution. Includes practical examples of independent and dependent variables for accurate correlation analysis.

Don’t panic if your Cronbach’s Alpha is below 0.7! This article explains how to review and improve the reliability of your questionnaire and introduces Data Investigator — experts in statistical data analysis, thesis support, and research consulting with over 15 years of professional experience.