Tag: business economics and quantitative methods

If the two regression coefficients are 0.8 and 0.2,then the value of coefficient of correlation is __________.

Which of the following techniques are used for the study of correlation?

If two polynomial of the degree 7 and 4 respectively are multiplied, find the degree of the resultant polynomial

Which of these is a Geometric series?

A leading MNC operating in India has decided to reduce the work force in the ratio of 15:12 and at the same time increased the workers salary in the ratio of 18:21, the total wages likely to be affected by this proposed plan will be_____.

If regression coefficient between x and y is -2/3, y on x is -1/6, the coefficient of correlation between x and y is_____.

Estimate the value of coefficient of correlation between x and y if the two coefficient of regression are 0.64 and 1 :___

The correlation coefficient is a measure of ________________.

Match the following :
List I
1. Correlation in Bivariable Frequency table.
2. Probable error and co-efficient correlation.
3. Rank correlation.
4. Karl pearson's co-efficient of correlation.
List II
a) $\dfrac{{\Sigma}{f}{d}{x} {d}{y} - {\dfrac{{\Sigma}{f}{d}{x} {\Sigma}{f}{d}{y}}{N}}}{\sqrt{{\Sigma}{f}{d}{{x}^2} - {\dfrac{({\Sigma}{f}{d}{x})^2}{N}}}{\sqrt{{\Sigma}{f}{d}{{y}^2} - {\dfrac{({\Sigma}{f}{d}{y})^2}{N}}}}}$
b) $ r = 0.6745 \dfrac{{-r}^2}{\sqrt{N}}$
c) $ r = 1 - \dfrac{{6}{\Sigma}{{d}^2}}{n({{n}^2 - {1})}}$
d) $ r = \dfrac{{\Sigma}{x}{y}}{{N}{\sigma}{x}{\sigma}{y}}$
Codes :
1   2   3  4

Karl Pearson's co-efficient of correlation between two variables is _____________.