Dr. Mottle's experiment includes randomizing subjects to a group ...

[sc00by25]

Dr. Mottle's experiment includes randomizing subjects to a group that gets a needle -stick or to a group that gets a fake needle-stick.
 
   Differentiate experimental group from control group.
 
  What is the role of the placebo in experimental design? Give another example of use of a placebo.
  What will be an ideal response?

Question 2

Which of the following illustrates reliability?
 
  a. Dean takes an IQ test and scores at the 60th percentile.
  b. Scores on a new test of reading comprehension correlate highly with scores on well established reading comprehension tests.
  c. Fred scores poorly on one school's entrance exam but does better on another.
   d. Jacquie takes three practice GRE verbal exams and scores 300, 299, and 301 .

[manuelcastillo]

Answer to Question 1

Experimental group receives the active intervention, the control group receives no intervention or an inactive intervention such as a placebo. A placebo is an inactive substitute for a true intervention. It is sometimes called a sugar pill, but can be something other than a pill. For example a researcher could use a fake camera for a
placebo and a real camera in the experimental group.

Answer to Question 2

D