Maria's sisters have died, as have most of her closest friends. At age 78, Maria has left her house, her neighborhood, and her church activities and moved to another state in order to live close to her oldest son and his family. Describe the two potential effects this move might have on Maria's personal relationships. List two risks if Maria does not have the ability or the opportunity to make new friends.

Professor Murphy tested a 6-year-old child, Madeline, on three conservation problems: conservation of volume, conservation of mass, and conservation of number

Madeline displayed stage 2 reasoning on the volume and mass problems, but stage 3 reasoning on the number problem. Madeline's performance violated which of the following assumptions of the stage concept? a. abruptness assumption b. concurrence assumption c. the assumption of coherent organization d. the assumption of qualitative change

Compared to the Pearson r, the Spearman r is a

a. more powerful test b. less powerful test c. test of equal power d. none of these, since power cannot be established for the r