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Sukanya Das, Lovely Professional University  Unit-29: Correlational Analysis: Test of Significance and Co-variance



                    Unit-29: Correlational Analysis: Test of Significance                                  notes

                                            and co-variance





                    CoNteNts
                    objectives
                    introduction
                    29.1   Subject-Matter: What is Correlation?

                    29.2   Definitions of Correlation
                    29.3   Kinds of Correlation
                    29.4   Methods of Measurement of Correlation
                    29.5   scatter Diagram or Dotogram
                    29.6   Correlation Graph
                    29.7   Coefficient of Correlation
                    29.8   summary

                    29.9   Keywords
                    29.10  review Questions
                    29.11  further readings



                objectives

                After studying this unit students will be able:
                      y  To define the mutual relationship between the various categories of facts.
                      y  Understand the kinds of correlation and various methods of measurements of correlation.

                introduction

                An objective of presentation of facts is to give a description briefly and specifically of various facts
                and to define their comparative state. These goals are also achieved through measurements of central
                tendency. Mean, median and mode are used for accurate measurements of their central tendencies
                and also give them a short form. But only by making short the gathered facts doesn’t help to ease
                the analysis and result formation because by doing so we get absolute results which are not of much
                use for us.  To make them more useful it is necessary to define the mutual relationships between the
                various categories of facts. The procedure of correlation fulfils the goal of this and before writing
                anything more in this direction, let us first understand the meaning of correlation.

                29.1   Subject-Matter: What is Correlation?

                explaining the meaning of correlation, Prof. Katariya writes—We usually want to know what the
                relation between two inter-related categories is. it is commonly seen that when there is an increase






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