An alcohol awareness taskforce at a Big Sky university sampled 400 students after the midterm to ask them whether they went bar-hopping the weekend before the midterm or spent the weekend studying and whether they did well or poorly on the midterm. The following result was obtained:   Did well on the midterm Did poorly on the midterm Studied for the midterm 150 50 Went bar hopping 80 120 Referring to the table above, what is the probability that a randomly selected student did well on the midterm or studied (for the exam) the weekend before the midterm?

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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.