Dr. Kim varies the amount of caffeine given to three groups of ...

[bucstennis@aim.com]

Dr. Kim varies the amount of caffeine given to three groups of participants (0, 100, and 200 mg) and then observes the anxiety level for each group. The 0-mg condition represents the ____ group.
 
  a. experimental
 b. manipulation check
  c. no-treatment control
  d. waiting-list control

Question 2

What type of sample selects n units out of N such that each NCn has an equal probability of being samples, simply by using a table of random numbers, a computer random-number generator, or a mechanical device to select the sample?
 
  a. simple random
 b. stratified random
 c. systematic random
  d. cluster random

[chjcharjto14]

Answer to Question 1

c

Answer to Question 2

a

[bucstennis@aim.com]

Thanks for the timely response, appreciate it

[diana chang]

Excellent