5. Select all the statements that would
show that quadrilateral PQRS is a
parallelogram.
A. Show that slope of PQ = W
slope of RS and PS = QR.
B. Show that slope of PQ =
slope of RS and PQ = RS.
C. Show that midpoint of PR is
the same as midpoint of QS.
D. Show that (slope of PR)
(slope of QS) = -1.
E. Show that PR = RS.

In a study of the relationship between socio-economic class and unethical behavior, 129 university of california undergraduates at berkeley were asked to identify themselves as having low or high social-class by comparing themselves to others with the most (least) money, most (least) education, and most (least) respected jobs. they were also presented with a jar of individually wrapped candies and informed that the candies were for children in a nearby laboratory, but that they could take some if they wanted. after completing some unrelated tasks, participants reported the number of candies they had taken. it was found that those who were identiď¬ed as upper-class took more candy than others. in this study, identify: (a) the cases, (b) the variables and their types, (c) the main research question, (d) identify the population of interest and the sample in this study, and (e) comment on whether or not the results of the study can be generalized to the population, and if the ď¬ndings of the study can be used to establish causal relationships.