Jan 19, 2016 · Specificity identifies the proportion of individuals. Specificity = Identifies the proportion of individuals who truly DO NOT have the disease AND were given the correct negative test result. Explain the three major types of epidemiologic studies – cant prove cause and effect 100% Intervention study o Has an experimental and a control group o ...
Calculate the point prevalence (PP) for Alzheimer’s disease among individuals 65 years of age or older in a county that has 200,000 individuals who are 65 years of age or older, if 22,223 individuals who are 65 years of age or older have the disease. PP=Number of persons with disease/ Number of persons examined at baseline 22,223/200,000= 0.1111
Question 1 1.875 out of 1.875 points The proportion of the sample with disease is computed by taking the ratio of the number with disease to the total sample size. Question 2 1.875 out of 1.875 points The term clinical means that the study involves people. Question 3 1.875 out of 1.875 points A subset of the population of interest is often ...
During the second year, 78 disease-free patients contributed 78 person-years, plus ½ years for the 2 with newly diagnosed eye disease, the 2 who had died, and the 10 lost to follow-up (all events are assumed to have occurred randomly during the year, or an average, at the half-year point), for a total of 78 + 14 × ½ years, for another 85 years.
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Periodontal status refers to gum disease where individuals are classified as either healthy, have gingivitis, or have periodontal disease.
A — a randomly chosen person has blood type A, and. B — a randomly chosen person has blood type B. In rare cases, it is possible for a person to have more than one type of blood flowing through his or her veins, but for our purposes, we are going to assume that each person can have only one blood type.
An important point to understand here is that “event A does not occur” is a separate event that consists of all the possible outcomes that are not in A and is called “ the complement event of A .”. Notation: we will write “not A” to denote the event that A does not occur.
The Addition Rule for Disjoint Events can naturally be extended to more than two disjoint events. Let’s take three, for example. If A, B and C are three disjoint events
A person with type A can donate blood to a person with type A or AB. A person with type B can donate blood to a person with type B or AB. A person with type AB can donate blood to a person with type AB only. A person with type O blood can donate to anyone.
Conditional Probability. Two events E and F are independent if the occurrence of E in a probability experiment does not affect or alter the probability of event F occuring. In other words, knowing that E occurred does not give any additional information about whether F will or will not occur; knowing that F occurred does not give any additional ...
If the two events are not independent, then they are said to be dependent. If two events are dependent, it does not mean that they completely rely on each other; it just means that they are not independent of each other. In other words, there is some kind of relationship between E and F, even if it is just a very small relationship.
The ELISA is a test to determine whether the HIV antibody is present in a patient’s blood. The test is 99.5% effective. This means that the test will accurately come back negative if the HIV antibody is not present.