ome financial theoreticians believe that the stock market’s daily prices constitute a “random walk with positive drift”. If this is accurate, then the Dow Jones Industrial average should show a gain on more than 50 percent of all trading days. If the average increased on 101 of 175 randomly chosen days, what do you think about the suggested theory? use a 0.01 level of significance.
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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Some financial theoreticians believe that the stock market’s daily prices constitute a “random walk with positive drift”. If this is accurate, then the Dow Jones Industrial average should show a gain on more than 50 percent of all trading days. If the average increased on 101 of 175 randomly chosen days, what do you think about the suggested theory? use a 0.01 level of significance.
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