A random sample of n = 4 scores is obtained from a population with a mean of µ = 80 and a standard deviation of ? = 10 . If the sample mean is M = 90, what is the z-score for the sample mean?

The first sign of dementia is typically

A) memory problems. B) lack of alertness. C) motor control problems. D) lack of attention to the environment.

People are most successful at noticing an analogous relationship between problems if they focus on

a. surface features. b. structural features. c. operators. d. mental sets.