In Educational research, One of the method in the descriptive method is correlation study.In it coefficient of correlation is found out.

1. Correlation study
By Dr. Neha Deo

2. • Correlation study determines the extent of
relationship between variables.
• Such studies are used to obtain description
of existing phenomenon & enable
researcher to ascertain extent to which
variations in one variable are associated with
the variation in the other variable.

3. One can find correlation between
• Intelligence & achievement in mathematics
• Intelligence & achievement in Science
• Interest & achievement
• Interest & attitude
• Interest & aptitude
• Attitude & aptitude

4. Identifying & defining the problem
Formulating the Hypothesis
Selection of the sample
Selection of the design & collection of data
Analysis –finding the co-efficient of correlation &
Interpretation
Writing the research report

5. • Direction of the correlation may be positive or
negative.
• Multiple or partial correlation can also be found
out.
Interpretation of the correlation obtained between
two variables depends upon -
Degree of the magnitude (value)
Sign
Statistical significance of the magnitude.

6. • Coefficient of Correlation is just a
number & not percentage.
• Coefficient of correlation gives
quantitative determination of the degree
of relationship. It doesn't necessarily
indicates cause & effect relationship.

7. ???
Increase in the first variable is associated with
the increase in the other variable-This is a
positive relation.
Increase in the first variable is associated
with the decrease in the other variable-
This is a negative relation.
Increase in the first variable
couldn't predict anything about the
other variable. This is zero relation.

8. Interpretation of the value of correlation.
• “ -1” complete negative
• “0 to -0.9” negative
• “0” No relation .
• “0 to +0.9” Positive
• “+1” complete positive

9. VALUE OF COEFFICIENT OF CORRELATION INTERPETATION
0 TO +0.19 0 TO -0.19 VERY LOW-
NEGLIGIBLE
+0.20 TO + 0.39 -0.20 TO - 0.39 LOW
+0.40 TO +0.59 -0.40 TO -0.59 MEDIUM
+0.60 TO + 0.89 -0.60 TO - 0.89 GOOD
+.0.90 & ABOVE -0.90 & ABOVE EXCELLENT
+1.00 -1.00 COMPLETE

10. From the correlation one can predict the following
1) One Attribute from another Attribute-
e.g. Morality from family background.
2)Attribute from measurement-
e.g. Morality from I.Q.
3)Measurement from Measurement-
e.g. Academic achievement from I.Q.

11. Non Parametric
method-Spearman
rank difference
method -Rho Parametric
method-Pearson
product moment
method-r