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Q. Mean ± 2 S.D. covers .............. % area of normal curve.

Q. When the values of two variables move in the opposite direction, correlation is said to be……

Q. When the amount of change in one variable leads to a constant ratio of change in the other variable, correlation is said to be ............................

Q. The quantitative measure of correlation between two variables is known as.....................

Q. If X and Y are independent , the value of regression coefficient byx = ....................

Q. Scatter diagram is also called ...................................

Q. If the correlation between the two variables , X and Y is negative, the regression coefficient of Y on X is .............................

Q. Chance Nodes are represented by __________

Q. ……….is the study of correlation among three or more variable simultaneously.

Q. Scatter diagram of the various values of ( X, Y) gives the idea about .......................