Anscombe's quartet (in the correlation lecture/slides) is an llfustration of the importance of ______ before conducting statistical analyses with sofware to axamine a relationship between variables.
"You can also read about Anscombe's quartet https:llowardsdatascience com/importance-of-dala-visualization-anscombes-quartef-way-ak25t4fogtd?"

a. examining data carefully (6caterplot, outiers..)
b. calculating the means of each variable
c. calculating correlation statistics by hand
d. considering the direction of a linear felationship