"Asbestos represents one of the most heavily studied occupational and environmental hazards of human history." Beh and Smith (2011) review the use of odds ratio (OR) within the subdiscipline of occupational exposure. The concept of 'risk' with respect to a particular exposure has been and continues to be a fundamental standard measurement for assessing a "hazard." ORs are regularly used to approximate relative risk (RR). The table below is a hypothetical subset of workers involved in the industrial manufacturing for 6 months or more between the years of 1940 - 1970. We are looking at the exposure of the worker to asbestos in the workplace and if they developed asbestosis during their lifetime. Asbestos Exposure No Asbestos Exposure Asbestosis 10,477 3,915 No Asbestosis 7,187 5,890 Calculate the odds ratio and round your answer to two decimal places
Continuous Probability Distributions
Probability distributions are of two types, which are continuous probability distributions and discrete probability distributions. A continuous probability distribution contains an infinite number of values. For example, if time is infinite: you could count from 0 to a trillion seconds, billion seconds, so on indefinitely. A discrete probability distribution consists of only a countable set of possible values.
Normal Distribution
Suppose we had to design a bathroom weighing scale, how would we decide what should be the range of the weighing machine? Would we take the highest recorded human weight in history and use that as the upper limit for our weighing scale? This may not be a great idea as the sensitivity of the scale would get reduced if the range is too large. At the same time, if we keep the upper limit too low, it may not be usable for a large percentage of the population!
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