第 21 个问题For convenience, a researcher tested her experimental group and control group in two different locations. Because location was not held constant, it could be responsible for any observed difference in the dependent variable. In this example, the differing locations would be considered a(n)1 分within-group variable.confounding variable.between-groups variable.independent variable.

In a scientific experiment, the investigator manipulates the ______ variable(s) to determine whether it causes another variable to change.Multiple Choicestandardizedcontrol groupdependentindependentcontrol group and standardized

. A variable that is presumed to cause a change in another variable is called:A) An intervening variableB) A dependent variableC) An independent variableD) A numerical variableGroup of answer choicesBCAD

The variable that is manipulated, or changed, by an experimenter is called the __________________ variable.Group of answer choicesA. ControlB. ExtraneousC. IndependentD. Dependent

第 10 个问题Quasi-experiments cannot make causal claims because1 分all confounding variables are eliminated or controlled for.the dependent variables are random. there is no random assignment. the variables are manipulated.

The variable that the experimenter measures to see if it has changed, is called the _____________ variable.Group of answer choicesA. DependentB. ExtraneousC. ControlD. Independent