8Properties of Sample Statistics
8.1 Introduction
Several statistics have been presented in the previous chapters. The main ones are 
, 
, and the sample proportion, 
. Recall that 
is used to estimate the population mean 
, 
is used to estimate the population standard deviation 
, and 
is used to estimate the probability of success at the population level 
. Also, contrary to a parameter, such as 
, which is fixed, a statistic, such as , is random: we obtain different results whenever a different sample ...
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