We measure their diameters that is we have a random

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Unformatted text preview: the (population) mean µ, we select 100 balls at random. We measure their diameters. That is, we have a random sample X1 , . . . , Xn , n = 100 (these are random variable, we denote them with upper case letters). This is the experiment . Recall that once a sample is drawn, the obtained values are denoted with lower case letters, x1 , . . . , xn . To find the mean µ, we compute the sample mean, ￿n Xk X = k=1 n This is the statistics . We call statistics a function of the random sample. We might refer to it also as an estimator of µ. See top of page 218 for more about these. Recall (see Example §3.6.2) that...
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