A Researcher Conducts a Study to Examine Possible Contributors to Glycemic

A researcher conducts a study to examine possible contributors to glycemic control in a group of subjects who have type 2 diabetes mellitus in a local community.A convenience sample of patients includes patients from 28 to 65 years old who range in weight from normal to obese,with time since diagnosis ranging from several months to several years.To determine causality in this study,the researcher will

A) discuss outcomes in terms of the probability that education will improve glycemic control.
B) increase the manipulation of the independent variable to allow greater control by the researcher.
C) identify multicausal variables that may influence the outcome of glycemic control measures.
D) limit the study to younger persons only to minimize the effects of extraneous variables.

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