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same amount of time must be allotted to each treatment, and the crossover point must be related to time, not to the condition of the subject.Question 19 A nurse researcher wishes to identify rates of pertussis infection in children less than one year of age and then again at 6 years of age to examine the relationship of immunization status on infection rates in this population. This is an example of which type of study design?
Question 20 The intervention that the researcher manipulates is the _____ variable.