The correlation between the z-scores for x and for y is given by the following formula:
[tex]Z=\frac{X-\mu}{\sigma}[/tex]In this case:
[tex]Corr(x,y)=0.88[/tex]Therefore:
The correlation coefficient for the z-scores of x and y would be:
[tex]Corr(\frac{X-\mu_X}{\sigma_X},\frac{Y-\mu_Y}{\sigma_Y})[/tex]And it is equal to:
[tex]Corr(x,y)=0.88[/tex]Answer: C. 0.88
