Answer:
Answer = a. Explanatory variable: history of sleep apnea; and outcome: Alzheimer’s status.
Step-by-step explanation:
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)
-7 =
+ 14
take 14 to the other side
-7 -(14) =
-21 =
Multiply by 3 on either sides to isolate e and to find a value
-21 × 3 =
× 3
3 and 3 cancels out
-63 = e
Answer: C
Step-by-step explanation:
So, the original fraction is equal to
437,000
400,307
In the second number, the 7 is moved 3 places to the right, and the 3 is moved 2 places to the right.
(The digit 4 is used here simply to make the numbers be the same overall length. It can be changed to any other digit (except 3 or 7) or removed. Digits that are not 3 or 7 can replace any of the zeros.)