Daftar Isi:1. Characteristic of data 2. Taking a sample 3. Measures of central tendency 4. Deviation and variability 5. The normal frequency distribution vurve and its characteristics 6. Probability assessments 7. Sample characteristic and sampling error 8. The comparison of sample value-I 9. The comparison of sample value-II 10. Methods of correlation 11. Regression lines and confidence limits 12. Fluctuations and trends 13. The way ahead