What is the purpose of randomization, What is an example of a physiological measurement? Definition of a type "A" behaviour pattern Adjusted scores on the State-Trait Anxiety Scale Description of self-care abilities in patients with dementia Serial measurements of weights over time Ranges of values on two consecutive arterial blood gas analysesor random assignment of subjects, in a study? To ensure that all groups within a study are representative of the larger population. To increase the chances that the study groups will be different from each other with regard to extraneous variables To ensure that current events do not influence the outcomes of the study To eliminate the need for establishing specific study criteria and subject eligibility