1. Triangle ABC and triangle PQR are similar. Find the value of x.

Correlation can vary from +1  to -1. It also tells how strong the  linear association between the two quantities variables.

Those values close to +1  indicate a high-degree of positive correlation, and values close to -1 indicate a high degree of negative correlation.

A positive correlation exists where the high values of one variable are associated with the high values of the other variables.

A negative correlation means association of high values of one with the low values of the others.

and

Correlation can have a value:

+1 = perfect positive correlation

0 = no correlation (the values don't seem linked at all)

-1 = perfect negative correlation

Therefore, the only options are true :

A-The correlation coefficient gives us information as to how strong the linear association is between the two quantities variables.

B -The correlation coefficient has units of  measurement and does always lie between -1 and +1.

C - The closer the absolute value r is to 1, the stronger linear relationship between the two variables.