8. A bearing used in an automotive application is supposed to have a nominal inside diameter of 1.5 inches. A random sample has an average inside diameter of these bearings is 1.497 inches. Bearing diameter is known to be normally distributed with standard deviationo = 0.01 inch. What sample size would be required to detect a true mean diameter as low as 1.49 inches if you wanted the power of the test to be at least 0.6?
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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