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Category Archives: Evidence-Based Medicine

Linear Regression


The Regression Equation When analyzing data, it is essential to first construct a graph of the data. A scatterplot is a graph of data from two quantitative variables of a population. In a scatterplot, we use horizontal axis for the observations of one variable and a vertical axis for the observations of the other variable. […]

Inferences for Population Standard Deviations


Inferences for One Population Standard Deviation Suppose that we want to obtain information about a population standard deviation. If the population is small, we can often determine 𝜎 exactly by first taking a census and then computing 𝜎 from the population data. However, if the population is large, which is usually the case, a census is […]

Inferences for Population Proportions


Confidence Intervals for One Population Proportion Statisticicans often need to determine the proportion (percentage) of a population that has a specific attribute. Some examples are: the percentage of U.S. adults who have health insurance the percentage of cars in the United States that are imports the percentage of U.S. adults who favor stricter clean air […]

Evaluate The Article About Therapy (Randomized Trials)


Section 1 How Serious Is The Risk of Bias? Did Intervention and Control Groups Start With The Same Prognosis? Consider the question of whether hospital care prolongs life. A study finds that more sick people die in the hospital than in the community. We would easily reject the naive conclusion that hospital care kills people […]

Evidence-Based Medicine – How to Ask A Question


Foreground questions can be categorized into 5 types, including: 1.Therapy: determining the effect of interventions on patient-important outcomes (symptoms, function, morbidity, mortality, and costs) 2.Harm: ascertaining the effects of potentially harmful agents (including therapies from the first type of question) on patient-important outcomes 3.Differential diagnosis: in patients with a particular clinical presentation, establishing the frequency […]