1. The researcher did not contemplate the time frame for which the persons were depressed and the method of sampling was not applicable. It suggests that the participants were already willing to change.
2. Internal validity is the estimated fact about implications regarding cause-effect. It is only pertinent in studies that try to establish a causal relationship (KnowledgeBase, 2006). External validity is the degree to which the results of a study can be generalized to other situations and people. Validity is important because it observes research findings. If results from a study are not established as valid then they do not mean anything to a study. Meaningless findings cannot be used and ultimately become a waste of time and effort.
Within-subject …show more content…
Experimental designs in education provide a direct link to the research problem and facilitate the development of a logical chain of reasoning based on the interplay among investigative techniques, data and hypotheses to reach justifiable conclusion. They are ideal for establishing whether one or more factors caused change in an outcome because of their strong ability to enable fair comparisons. Different people have however, criticized the use of experimental design in education. They believe that using randomized experiments as the only scientific approach to gaining knowledge as myopic view of science in general and a misunderstanding of educational …show more content…
Internal validity shows the extent to which the results can be attributed to the manipulation of the independent variables rather than to some confounding variables. It ensures that only the intended variable cause changes to the dependent variables. A research with good internal validity has no intruders (confounds) and offers only one explanation to the results. This increases the relevance of the study to that specific group. External validity gives the extent to which the finding of a specific study group or sample can be generalized to the larger society or targeted group of people.
5. In an experiment, what is a control? What is the purpose of a control group? Of single or multiple comparison groups? A control in experiment is the group of participant on which the independent variables are not introduced. It is the portion of the experiment portion that a researcher does not perform the experiment on. Control represents the variables that are kept constant in an experiment. The main purpose of control in an experiment is to offer some basis for comparing the results between the treated sample and the control sample. It acts as the reference for any change that may be observed in the treated sample as a result of the experiment.
6. What are
2. Internal validity is the estimated fact about implications regarding cause-effect. It is only pertinent in studies that try to establish a causal relationship (KnowledgeBase, 2006). External validity is the degree to which the results of a study can be generalized to other situations and people. Validity is important because it observes research findings. If results from a study are not established as valid then they do not mean anything to a study. Meaningless findings cannot be used and ultimately become a waste of time and effort.
Within-subject …show more content…
Experimental designs in education provide a direct link to the research problem and facilitate the development of a logical chain of reasoning based on the interplay among investigative techniques, data and hypotheses to reach justifiable conclusion. They are ideal for establishing whether one or more factors caused change in an outcome because of their strong ability to enable fair comparisons. Different people have however, criticized the use of experimental design in education. They believe that using randomized experiments as the only scientific approach to gaining knowledge as myopic view of science in general and a misunderstanding of educational …show more content…
Internal validity shows the extent to which the results can be attributed to the manipulation of the independent variables rather than to some confounding variables. It ensures that only the intended variable cause changes to the dependent variables. A research with good internal validity has no intruders (confounds) and offers only one explanation to the results. This increases the relevance of the study to that specific group. External validity gives the extent to which the finding of a specific study group or sample can be generalized to the larger society or targeted group of people.
5. In an experiment, what is a control? What is the purpose of a control group? Of single or multiple comparison groups? A control in experiment is the group of participant on which the independent variables are not introduced. It is the portion of the experiment portion that a researcher does not perform the experiment on. Control represents the variables that are kept constant in an experiment. The main purpose of control in an experiment is to offer some basis for comparing the results between the treated sample and the control sample. It acts as the reference for any change that may be observed in the treated sample as a result of the experiment.
6. What are