Which of the following is a measure of how much a group of scores vary from their own mean?

Which of the following is a measure of how much a group of scores vary from their own mean?
 
  a) mode
  b) median
  c) central tendency
  d) standard deviation

Question 2

Nearly all drugs, including alcohol, stimulate
 
  a) sensation seeking pathways.
  b) GABA pathways.
  c) serotonin systems in the brain.
  d) dopamine systems in the brain.

Question 3

Which of the following age ranges fits the label old-old?
 
  a) 65-74
  b) 75-84
  c) 85-94
  d) 95+

Question 4

__________ is sometimes used to simulate feared situations such as flying.
 
  a) Virtual reality
  b) Visual simulation
  c) Memory flooding
  d) Operant conditioning

Question 5

What is the most commonly used measure of variability?
 
  a) mode
  b) median
  c) frequency
  d) standard deviation