The article "Credit Card Activity for College Students"† estimated that in 2013, 62% of undergraduates with credit cards pay them off each month and that the average outstanding balance on undergraduates' credit cards is $650. These estimates were based on an online survey of 800 college students. What additional information would you want in order to decide if it is reasonable to generalize the reported estimates to the population of all undergraduate students? (Select all that apply.) whether or not the students were randomly selected for the surveywhether or not the students were randomly selected to be in either the group that pays off their credit cards or the group that doesn'tconfounding variables that could be present in the studywhether or not undergraduate students without credit cards have any monthly debts they need to pay offfrom what population was the sample of college students selected

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2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.