A March 2015 survey by the Pew Research Center

(www.pewresearch.org) compared various groups of Americans in terms of their support for legalizing marijuana.

In considering age groups, it estimated that legalization was supported by 68% of those of age between 18 and 34, by 51% of those of age between 35 and 69, and by 29% of those of age 70 and higher.

(a) If results for the population of adult Americans were similar to these, would age and opinion about legalizing marijuana be independent, or dependent?

(b) Display hypothetical population percentages in a contingency table for which these variables would be independent.