Assignment 4 April 9, 2002
Due Thursday, April 16 in Class
PLEASE TYPE YOUR ANSWERS.
Prepare this part on a separate page from PARTII and PART III. Also, attach Part I of
Assignments 1, 2 & 3.
1. Restate your research question.
2. What typ
Random assignment of subjects to groups
Random assignment makes groups equivalent (hopefully)
in all variables, including prior subject characteristics.
Since the random assignment eliminates the selection
It illustrates the relationship between two variables
Strength (weak vs. strong)
Direction (positive vs. negative)
Numerical indicator of the linear relationship
+ values indicate positive relationship.
Measures of Central Tendency
( = so called average).
The most popular measure of central tendency.
Mathematically, Sum of Scores/The Number of observations
It is not good when data are not symmetrically distributed,
i.e., not good when data a