Electroconvulsive therapy, also called shock therapy, is no longer used as a treatment for depression

Samuel is interested in the impact of noise on excitability levels in children vs. teenagers. He exposes participants to a quiet room with no sounds (0 dB), music at 50 dB (normal conversational level), or music at 80 dB (the volume just below where hearing damage can occur). After exposing them to one of the noise conditions for 10 minutes, he immediately measures their excitability by measuring their heart rate. To test his hypothesis, Samuel is most likely to use which of the following statistical analyses?

a. Two way factorial ANOVA b. Mixed design ANOVA c. Repeated mixed ANOVA

On his early attempts to develop a measure of intelligence, Binet found that

(a) on the average, older children got more right (b) he could set up norms for children of different ages (c) at every age level, there were individual differences in the numbers of items correct (d) all of the above (e) none of the above