UNIT 9: ORGANISATION AND PRESENTATION OF DATA – MICRO NOTES
DATA ORGANISATION Meaning: Arranging raw data systematically through Editing, Classification, and Tabulation. 1. EDITING OF DATA Meaning: Checking collected data for mistakes to ensure quality. Check for: Completeness (no missing values), Consistency (same format), Accuracy (correct values), Homogeneity (same type). 2. CLASSIFICATION OF DATA Meaning: Grouping data based on common features (e.g., students by gender/marks). Objectives: Present facts simply, Show similarities/differences, Help comparison, Show relationships, Prepare for tabulation. Good Classification: Clear, Non-overlapping classes, Flexible, Stable, Suitable for enquiry, Arithmetically accurate. Basis of Classification: Chronological: Time (Jan 2022, Feb 2022). Geographical: Place (Kerala, Tamil Nadu). Quantitative: Numbers (age, marks 0-20, 20-40). Qualitative: Qualities (gender, occupation). STATISTICAL SERIES Meaning: Classified data arranged in logical order. Individual Series: Each i...