Consider the following statements:
1. Two independent variables are always uncorrelated.
2. The coefficient of correlation between two variables X and Y is positive when X decreases then Y decreases. Which of the above statements is/are correct?

The co-efficient of correlation between two variables x and y is 0.5. Their co-variance is 15 and sigma_(x)=6 , Then sigma_(y)=

If coefficient of correlation between two variables X and Y is 0.64, cov(X, Y)= 16" and "Var(X)= 9 , then the standard deviation of Y series is

Consider the following statements: 1. Coefficient of variation depends on the unit of measurement of the variable. 2. Range is a measure of dispersion. 3. Mean deviation is least when measured about median. Which of the above statements are correct?

Coefficient of correlation between two variable X and Y is 0.32. Their covariance is 7.86. The variance of X is 10. Find the standard deviation of Y-series.