Devon clings to his mother. When she leaves the room, he cries loudly, but when she returns to comfort him, he kicks and squirms. Mary Ainsworth would say he is

The value of r may lie within an interval of values ranging from _____

a. -1.00 to +1.00 b. 0.00 to +10.00 c. -10.00 to 0.00 d. 0.00 to -1.00

Random assignment of participants requires that _____

a. every person selected for the experiment has an equal chance of being assigned to any one of the treatment groups b. the selection of one person to participate in the experiment is independent of the selection of any other person c. all members of a population have an equal chance of being selected to participate in the experiment d. all the above