If given census bureau reports 33% of US adults have a college degree, for a randomly selected US adult, are the two events P(smartphone (SP)only user) and P(have a college degree(CD)) independent? P(SP)=.2 P(CD) = .1 thus, I get ==>P(SP|CD)=.02

How do you determine if it's independent or not if the census bureau shows 33% having CD?

Do you just multiply .2X.33 which is not equal to .02 so it's not independent