Re: correlation

Posted by ranjankumarnayak5 on Jan 30, 2017; 11:51am
URL: http://discussion-forum.276.s1.nabble.com/correlation-tp7603112p7603136.html

thank you sir for your help

On Thu, Jan 26, 2017 at 4:43 AM, Amit Goyal [via Discussion forum] <[hidden email]> wrote:

Covariance between y and z, Cov(y, z) = Cov(y, 2x+5) = 2Cov(y,x)
Standard deviation of z, SD(z) = SD(2x+5) = 2SD(x)

So, Correlation between y and z, Corr(y, z) = Cov(y, z) /(SD(y)SD(z)) = 2Cov(y, x) /(2SD(y)SD(x)) = Corr(y, x) = 0.36

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