Mrs. Thompson believes that her son has become an excellent student because she consistently praises him for good work, and as a result, he studies harder. Her belief best illustrates ___________ perspective

Which one is NOT true of erectile disorder?

a. ED is primarily a result of psychological, not physical, factors. b. About 20% of men over the age of 20 experience ED. c. ED rarely occurs in men younger than 50. d. The incidence of ED increases with age.

Which of the following provide an estimate of how often experimental results could have occurred by chance alone?

a. coefficients of correlation b. random selections c. graphical statistics d. tests of statistical significance