Tutor profile: Kristyn H.
Subject: Public Health
Professor Yu is interested in exploring the relationship between arsenic exposure in drinking water and hypertension. Yu conducts a case-control study involving 200 participants, 100 of whom have hypertension and 100 of whom do not. Of the participants with hypertension, 43 were exposed to arsenic through their drinking water, compared to 26 of the participants without hypertension. Calculate and interpret the correct measure of association for this study.
Since this is a case-control study, the measure of association that we are going to calculate is the Odds Ratio (OR). The formula for the Odds Ratio is (a/c) / (b/d), where "a" is the number of cases who were exposed, "c" is the number of cases who were not exposed, "b" is the number of controls who were exposed, and "d" is the number of controls who were not exposed. For this problem, a = 43, b = 26, c = 57, and d = 74. OR = (a/c) / (b/d) = (43/57) / (26/74) OR = 2.147 The OR can be interpreted as follows: Participants who have hypertension have 2.147 the odds of having been exposed to arsenic in their drinking water as participants without hypertension.
If (x/5) + 17 = 23, then solve for x.
Begin by subtracting 17 from both sides of the equation. This leaves us with (x/5) = 6. Then, to solve for x, multiply both sides of the equation by 5, which results in x = 30.
Subject: Basic Math
What is the sum of (1/4) + (3/8)?
(1/4) + (3/8) can also be thought of as (2/8) + (3/8). Then, the two numerators (2 and 3) add together, resulting in 5 over 8, or 5/8.
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