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Unformatted text preview: on of x series = (x2 / N) - (x/N) 2 Dy = standard deviation of y series = (y2 / N) - (y/N) 2 Shortcut Method using Assumed Mean
If short cut method is used using assumed mean, the formula for obtaining
Karl Pearson’s Co-Efficient of Correlation is: r Covariance between x and y
D x D y Covariance between x and y = dxdy / N - (dx/N X dy/N) Dx = (dx2 / N) - (dx /N) 2 Dy = (dy2 / N) - (dy /N) 2 dxdy / N (dx / N x dy / N) r (dx 2 / N) - (dx / N) 2 (dy 2 / N) - (dy / N) 2 dxdy = 494 N = 12 dx = 43 dy = 54 dx2 = 407 dy2 = 944 494/12 (43/12 X 54/12)
407 / 12 (43 / 12) 2 944 / 12 (54 / 12) 2 Sikkim Manipal University Page No. 210 Research Methodology Unit 11 41.17 - (3.58 4.5)
33.96 - 12.91 78.66 20.25 41.16 16.11
Interpretation: There is good positive correlation between x and y variable.
Self Assessment Questions
State whether the following statements are true or false:
1. Coding need not necessarily be numeric
2. A mere tabulation or frequency count or graphical representation of the
variable may be given an alphabetic coding.
3. A coding of zero has to be assigned carefully to a variable. 11.14. Summary
Data processing is an intermediary stage of work between data collections
and data interpretation. The various steps in processing of data may be
o Identifying the data structures o Editing the data o Coding and classifying the data o Transcription of data o Tabulation of data. Sikkim Manipal University Page No. 211 Research Methodology Unit 11 The identification of the nodal points and the relationships among the nodes
could sometimes be a complex task than estimated. When the task is
complex, which involves several types of instruments being collected for the
same research question, the procedures for drawing the data structure
would involve a series of steps. Data editing happens at two stages, one at
the time of recording the data and second at the time of analysis of data. All
editing and cleaning steps are documented, so that the redefinition of
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This note was uploaded on 04/15/2010 for the course MBA mba taught by Professor Smu during the Spring '10 term at Manipal University.
- Spring '10