This is the seventh module of the course in Guidance and Counselling. It aims at developing basic statistical literacy especially in the context of guidance and counselling. The units covered in this module will help you to understand the statistical data given in the test manuals, and to analyse and interpret test scores.
The first unit deals with the importance of statistics in guidance and counselling. It also covers the three commonly used measures of central tendency, i.e., the mode, median and mean. These statistics are powerful because they can reduce huge arrays of data to a single, easily understood number. The second unit focuses on measures of variability which summarise information about the heterogeneity or variety in a distribution of scores. It may be noted that while measures of central tendency, locate the central points of the distribution, measure of variability indicate the amount of diversity in the distribution. The third unit of this module examines the concept of normal probability curve which is of great importance in statistics. It, in combination with the mean and standard deviation, can be used to construct precise descriptive statements about distributions that are normally distributed.
There are Self-check exercises and activities in every unit which will help you evaluate your progress through the module. Summary given at the end provides an overview of the unit, and references and suggested readings give additional sources of information.
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