| A | B |
|---|
| variable | Characteristic or condition that can change / take on different values |
| population | entire group of individuals |
| most research begins with: | a general question re: relationship between 2 variables from a population |
| sample | selected to represent the population |
| discrete variables | e.g., class size; consist of indivisible categories |
| continuous variables | e.g., time or weight; infinitely divisible |
| real limits | half way between adjacent categories; used to define units for continuous variable |
| Measurement | to establish relationships between variables, must observe the variables & record observations |
| Scale of Measurement | the process of measuring a variable requires a set of categories called ~ |
| nominal scale | an unordered set of categories identified only by a name |
| ordinal scale | an ordered set of categories; direction or difference between 2 individuals |
| interval scale | ordered series of equal-size categories;direction of diff. btwn 2 individuals |
| ratio scale | interval scale where a value of zero = none of the variables |
