Question: Section 1-4 For Exercises 45-48, identify each study as being either observational or experimental. 45.Subjects were randomly assigned to two groups, and one group was

Section 1-4 For Exercises 45-48, identify each study as being either observational or experimental. 45.Subjects were randomly assigned to two groups, and one group was given an herb and the other group a placebo. After 6 months, the numbers of respiratory tract infections each group had were compared. 46.A researcher stood at a busy intersection to see if the color of the automobile that a person drives is related to running red lights. 47.A sample of females were asked if their supervisors (bosses) at work were to hug them, would they consider that a form of sexual harassment? 48. Three groups of gamblers were randomly selected. The first group was given $25 in casino money. The second group was given a $25 coupon for food. The third group was given nothing. After a trip to the casino, each group was surveyed and asked their opinion of their casino experience

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