The value that stays the same as long as there are no signals in the neuron is known as

When people report the presence or absence of a stimulus, they make correct judgments, misses, and false alarms. Which field deals with analyzing their answers?

a. Opponent-process theory b. The Young-Helmholtz theory c. Gestalt theory d. Signal-detection theory

Given a normal distribution of intelligence test scores (mean=100, s.d.=15), what is the probability that someone will score between 100 and 115?

a. cannot be determined b. .15 c. .68 d. .34