Selection bias and individual differences are both potential problems dealing with the participants in a study. Identify which of these is a threat to internal validity and which is a threat to external validity. Describe how each one is a threat.
Selection bias and individual differences are both potential problems dealing with the participants in a study. Identify which of these is a threat to internal validity and which is a threat to external validity. Describe how each one is a threat.
Validity refers to that quality of a test which measures what what it claims to measure.
Internal validity refers to the degree of confidence that the causal relationship being tested is trustworthy and not influenced by other factors or variables.
External validity refers to the extent to which results from a study can be applied (generalized) to other situations, groups or events.
Selection bias occurs when the researcher selects the sample size which is suitable to him and which may or may bot be suitable to the research. In such cases proper randomization is not taken into account.
Individual differences refers to the enduring characteristics that distinguishes organisms from one another and that are stable over time and across situations. These characteristics have included cognitive, affective, behavioral, and/or genetic traits ascribed to persons or animals.
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