Index numbers Probability 5 Correlation 4 Linear regression 3 Time series 3 Economics 2 Quality control 2 Regression 2 Statistics 2 Vital statistics 2 Central tedency 1 Central tendency 1 Computer applications 1 Consumption 1 Data collection 1 Decicion theory 1 Demand Analysis 1 Demand analysis 1 Hypothesis Tests 1 Inter polation 1 Linear programming 1 Management 1 Probabiliry 1 Profability 1 Psychological statistics 1 Quantitative techniques 1 Ratio of variation 1 Samplilng 1 Sampling theory 1 Simple correlation 1