Correlation Tes...

What is the formula to calculate Spearman's rank correlation coefficient when ranks are not repeated.

For two variables $$x$$ and $$y$$ regression equations are given as $$7x-3y-18=0$$ and $$4x-y-11=0$$ then the correlation coefficient between $$x$$ and $$y$$ is 

If the covariance between x and y is $$30$$, variance of x is $$25$$ and variance of y is $$144$$, then what is the correlation coefficient?

Correlation coefficient is denoted by the letter________.

Which of the following is advisable to use while interpreting the value of co-efficient correlation?

The formula of Karl Pearson's co-efficient of correlation is ________.

Defects of Karl Pearson's method is/are________.

The formula of product moment correlation is ______________.

What are the assumptions of correlation co-efficient?
I. There is non-linear relationship between two variables.
II. The two variables have cause and effect relationship.
III. Each variable is affected by a large number of independent causes.
IV. If the error is reduced to minimum, the co-efficient of correlation is more reliable.

Rank correlation is useful where____________.