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A​ __________ exists between two variables when the values of one variable are somehow associated with the values of the other variable.

A correlation: exists between two variables when the values of one variable are somehow associated with the values of the other variable. 

When determining whether there is a correlation between two​ variables, one should use a​ ____________ to explore the data visually.
__ Scatterplot. 

Which of the following statements about correlation is​ true?
c:- We say that there is a positive correlation between x and y if the​ x-values increase as the corresponding​ y-values increase.

The​ ______________ measures the strength of the linear correlation between the paired quantitative​ x- and​ y-values in a sample.
: linear correlation coefficient r