Question

question 38 (1 point) saved exhibit 7 - 11 a student doing an internship at a large research firm collected the following data, representing all of the studies the firm had conducted over the past 3 years. randomization part of study? retro. pro. type of study observational observational experiment yes 7 28 35 no 53 62 115 refer to exhibit 7 - 11. define the events e = (the study was an experiment), u = (the study used randomization) and r = (the study was a retrospective observational study). which of the following sets of events are disjoint? e and u e and r u and r all three none of the above question 39 (1 point) saved

Explanation:

Disjoint events cannot occur at the same time. An observational study (Retro - observational and Pro - observational) cannot be an experiment simultaneously, and a study that uses randomization cannot be a non - randomized study. So events E (experiment) and U (used randomization) are not disjoint as an experiment can use randomization, E and R (retrospective study) are disjoint as an experiment cannot be a retrospective study, and U and R are disjoint as a retrospective study is not usually randomized.

Answer:

E and R, U and R