This preview shows page 1. Sign up to view the full content.
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,
X = k=1
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...
View Full Document
- Fall '08