Which of the following are true about the variance of a random variable? it depends on the number n of data values acquired in an experiment it has the same units as X it can be calculated as [ E(X*X) - u*u ], where u is the expected value of X it depends on n-1, where n is the number of data values acquired in an experiment it can be calculated as the square root of [ E(X*X) - u*u ], where u is the expected value of X
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!
Which of the following are true about the variance of a random variable?
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it depends on the number n of data values acquired in an experiment |
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it has the same units as X |
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it can be calculated as [ E(X*X) - u*u ], where u is the |
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it depends on n-1, where n is the number of data values acquired in an experiment |
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it can be calculated as the square root of [ E(X*X) - u*u ], where u is the expected value of X |
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