7.1-10 A leakage test was conducted to determine the elfectiveness of a seal designed to keep the inside of a plug airtight. An air needle was inserted into the plug, and the plug and needle were placed under water. The pres- sure was then increased until leakage was observed. Let X equal the pressure in pounds per square inch. Assume that the distribution of X is N(u, o2). The following n = 10 observations of X were obtained: %3D 3.1 3.3 4.5 2.8 3.5 3.5 3.7 4.2 3.9 3.3 Use the observations to (a) Find a point estimate of u. (b) Find a point estimate of o. S (c) Find a 95% one-sided confidence interval for u that provides an upper bound for u.
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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