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Which of the following statements uses $r$, the correlation coefficient, correctly?
The correlation between price of pizza and number of toppings is $r = 0.98$ dollars per topping.
There is a moderate correlation ($r = 0.56$) between hours studying for a test and percent correct on the test.
There is a strong correlation ($r = 0.82$) between race and musical preference.
The correlation between age and shoe size is $r = 1.34$.
If the correlation between a person’s AP Stats grade and AP English grade is 0$.68$; the correlation becomes $-0.68$ when explanatory and response variables are switched.