CBSE Class 11 Psychology What is Statistics

Read and download CBSE Class 11 Psychology What is Statistics chapter in NCERT book for Class 11 Psychology. You can download latest NCERT eBooks chapter wise in PDF format free from This Psychology textbook for Class 11 is designed by NCERT and is very useful for students. Please also refer to the NCERT solutions for Class 11 Psychology to understand the answers of the exercise questions given at the end of this chapter

NCERT Book for Class 11 Psychology What Is Statistics

Class 11 Psychology students should refer to the following NCERT Book chapter What Is Statistics in standard 11. This NCERT Book for Grade 11 Psychology will be very useful for exams and help you to score good marks

What Is Statistics NCERT Book Class 11



Researchers deal with a large amount of data and have to draw dependable conclusions on the basis of data collected for the purpose. Statistics help the researchers in making sense of the enormous amount of data. Let us first understand the term statistics. Technically “statistics” is that branch of mathematics which deals with numerical data. Researchers are interested in variables. Variables refer to some aspect of a person, an object or environment that can be measured and whose value can change from one observation to the other. Statistics deals with description, summarising and representation of data. The inferential statistics helps to draw conclusions from data. The process of measurement involves use of rules to assign a number to a specific observation of a variable. Psychologists use four levels of scales: Nominal, Ordinal, Interval, and Ratio. Nominal scale is at the lowest level and ratio the highest. In general higher we go up the scale type, more information is contained in the scale.


After collecting data, the next step is to organize the data to get a quick overview of the same. Graphical representation helps us in achieving this objective. It is a part of the descriptive statistics through which we organize and summarise the data. The outcome is visually presented that makes it easy to see pertinent features of the data. Such presentations are called graphs.

There are different kinds of graphs. However, here we shall consider only the Bar Diagram, the Frequency Polygon, and the Histogram. These graphs have much in common, especially the frequency polygon and histogram, though, they look different.

Basic Procedures

Graphed frequency distributions generally have two axes: horizontal and vertical. The horizontal axis is called X-axis or abscissa and the vertical axis the Y-axis or ordinate. It is customary to represent the independent variable on the X-axis and dependent variable on the Y-axis. The intersection of the two axes represents the origin or the zero point on the axis. However, if the initial score (or midpoint of the class interval) of a data to be represented on the graph is away from zero (e.g. midpoint 142 in table 1), we break the horizontal line (axis) to indicate that the portion of the scale is missing.

To make the graph look symmetrical and balanced, it is customary to keep the height of the distribution about three-quarters of the width (height 75 pc of the width). Some trial and error may be necessary to create graph suitable in size and convenient in scale. The graph should be given clear and suitable caption with figure number and labels on both the axes. The caption of a graph is written below the graph with a suitable figure number.

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