| A | B |
|---|
| A study that involves no researcher intervention is called | an observational study |
| a variable that interferes with other variables in the study is called | a confounding variable |
| two major branches of statistics | descriptive and inferential |
| two uses of probability | gambling (playing cards) and insurance industry |
| The group of subjects selected from the group of all subjects under study is called a(n) | population |
| three reasons why samples are used in statistics are | expense. time, and size of population |
| four basic sampling methods are | random, systematic, cluster, stratisfied |
| a researcher divided subjects into two groups according to gender and then selected from each group for her sample. what sampling method was used? | stratisfied |
| data that can be classified according to color | nominal |
| the number of absences per year of a worker is | discrete |
| a study that uses intact groups when it is not possible to randomly assign participants to the group is called | quasi experimental |
| in a research study, participants should be assigned to groups using | random methods |
| independent variable | a variable in an experimental study that is being manipulated by the researcher; it is also called the explanatory variable |
| dependent variable | the resultant variable or the outcome variable of an experimental study; it is the variable studied to see if it has changed significantly due to the manipulation of the independent variable; examples giving two different groups different exercise instructions |
