If a researcher conducts a study in which she directly manipulates a variable of interest to determine its effects on another variable, she is exerting _______ in the research design

Which motto would best fit the id?

A) "I can't do that because it is against the rules." B) "I would like to do that, but I can wait for later." C) "If it feels good, then do it." D) "If she did it, I can too."

According to the text, the positivity effect is best described as:

a. older adults' increased ability to look on the "bright side" of health-related problems b. the peace that they feel as they assume fewer responsibilities for caring for others c. older adults' decrease in intellectual flexibility such that they feel more positive they are right d. the tendency to remember positive information better than negative information