Which of the following threats to internal validity arises when participants in one group develop at a faster rate than participants in another group? A. The additive effect of selection and testing. B. The additive effect of selection and history. C. The additive effect of selection and maturation. D. The additive effect of selection and instrumentation.

In an experimental research design, internal validity is primarily referred to as: Group of answer choicesThe extent to which the results are attributed to the manipulated independent variableThe best basis for determining one variable's influence on another variableThe ethical considerations in conducting experimentsThe findings can be generalised beyond experiment data to different populations

Which of the following is not a threat to internal validity of a study A. subject mortality B. predictive validity C. history D. maturation

Which of the following is a threat to internal validity found in within-groups designs but not in independent (between)-groups designs? Group of answer choicesdemand characteristicsdesign confoundpractice effectsselection effects

Generalization is a key issue in:a. internal validityb. external validityc. a double-blind experimentd. a single-blind experiment

When the results of an experiment can confidently be attributed to the effect of the independent variable, the experiment is said to have A. been controlled B. internal validity C. achieved its aim D. external validity