Highway engineers sometimes paint stripes on freeway off-ramps to enhance the perception of depth, using the cue of

Which of the following is true of sleepwalking episodes?

a. They tend to occur during the first stages of sleep. b. They appear to involve the enactment of a dream. c. They are more common in adults than in children. d. Repeated episodes can cause significant personal distress.

When the vast majority of scores cluster tightly around the mean,

the graphed distribution is leptokurtic. Indicate whether the statement is true or false