The album by anton chekhov how does chekhov's use of terms such as "titular councilor" and "actual civil councilor" affect the passage? a. it make the story an accurate portrayl of nineteenth-century russian government. b. it reveals the nature of the personal relationship between two characters in the story. c. it sheds light on the contrast between zhmyhov's behavior in his office and his behavior with his family. d. it clarifies the reason why zhmyhov's coworkers have chosen to give him a special gift.
Answer = a. Explanatory variable: history of sleep apnea; and outcome: Alzheimer’s status.
This is Case-Control analytical study where the cases are the 50 participants with Alzheimer’s and the control are the 50 participants without Alzheimer’s. This type of study requires the formulation of certain hypothesis in an attempt to investigate the possible factor (sleep apnea) of a particular health condition (Alzheimer’s disease). The outcome of the studies will explain the roles of specific factors in the incidence and prevalence of a disease. This type of study investigates the hypothesis that there is a relationship between suspected causal factor (sleep apnea: which is referred to as the explanatory variable) and a disease (Alzheimer’s disease: which is referred to as the outcome variable). The study group is selected on the basis of presence or absence of the ‘outcome variable’ which is the disease where the factors (explanatory variable) are already present or not in the case (50 participants with Alzheimer’s) and its controls (50 participants without Alzheimer’s)