By the time a child reaches the age of __________ he/she is able to use rehearsal techniques to improve his/her memory

According to the article For Better or Worse concerning marital satisfaction in middle aged adults, in the main study in the article four groups were composed based on the internality or externality of husbands and of wives

Where "I" and "E" stand for the locus of control for individuals within a pair, the most satisfied group was the ___ group: (a) I/I (b) I/E (c) E/I (d) E/E

The place theory and the frequency theory help to explain _______

a. how a wide range of frequencies is heard by the ear b. how amplitude is regulated by the ear c. how sounds are located d. how "boilermakers' deafness" occurs