ustimate population mean (o is known): A biologist studying a colony of beetles selects and weighs a random sample of 20 adult males. She knows that, because of natural variability, the weights of such beetles are normally distributed with standard deviation 0.25 g. Their weights, in grams, are as follows (Round to two decimal places): 5.2 5.4 4.9 5.0 4.8 5.7 5.2 5.2 5.4 5.1 5.6 5.0 5.2 5.1 5.3 5.2 5.1 5.3 5.2 5.2 (a) Find the mean weight of the beetles in this sample. (a) (b) Find 95% confidence limits for the mean weight of such beetles. (b)
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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