# Basics

Tabulation of Data – Meaning | Parts of Table | Objectives | Advantages

One of the simplest ways to summarize data is to present it in tabular form. A table is a systematic arrangement of statistical data in rows and columns. The clear-cut and systematic arrangement allows...

Mailed Questionnaire Method of Data Collection

This method consists in preparing a questionnaire (a list of questions relating to the field of inquiry and providing space for the answers to be filled by the respondents) which is mailed to the...

Lag and Lead Correlation

When there exists a cause and effect relationship between two time series, it is usually observed that there is a time lag between the changes in the values of the independent variable (also called...

Class Width – Explained with Examples

The class width of a given frequency distribution refers to the length of the class intervals of the distribution. Therefore, class width is indeed the same as the class size. Another name for the...

Deviation Bar Graph – Definition & Examples

Deviation bar charts are important for graphic presentation of net quantities such as surplus or deficit, net profit or loss, net of imports, and exports which have both positive and negative values. The positive...

Pie graphs (or pie charts, or circle diagrams) represent relative frequency or percentage distributions with circles divided into sectors that are proportional in areas to the relative frequency or percentage values. If there is...

5 Examples of Mutually Exclusive Events

We say that two events are mutually exclusive if the occurrence of one event guarantees the non-occurrence of the other event. The two mutually exclusive events cannot occur simultaneously. In this article, we list...

Probability Axioms (3 Axioms of Probability)

It appears to be an empirical fact that if an experiment is continually repeated under the exact same conditions, then for any event E, the proportion of time that the outcome is contained in...