Question

1. the reason why the independent variable might not have caused an effect on the dependent variable are called threats to internal validity?

A. true

B. False

2. The use of existing natural groups of participants usually results in equivalent groups for an experiment

A. true

B. false

3. Mortality refers to the facts that participants may drop out of the experiemnts

A. true

B. false

4. A defining characteristics of an experiment is the unbiased assignment of participants to research conditions

A. true

B. False

Answer 1

• ANSWER-The reason why the independent variable might not have caused an effect on the dependent variable are called threats to internal validity-TRUE
• Internal validity is the extent to which a study establishes a trustworthy cause-and-effect relationship between a treatment and an outcome
• ANSWER- The use of existing natural groups of participants usually results in equivalent groups for an experiment-FALSE
• The use of existing natural groups of participants often results in nonequivalent groups.
• ANSWER-Mortality refers to the facts that participants may drop out of the experiments-TRUE
• ANSWER-A defining characteristics of an experiment is the unbiased assignment of participants to research conditions-FALSE
• The defining characteristic of experimental research is active manipulation of independent variables by an experimenter to study its effects on dependent variable.