2
In real life calculating parameters of populations
In real life calculating parameters of populations
is prohibitive because populations are very large.
is prohibitive because populations are very large.
Rather than investigating the whole population,
Rather than investigating the whole population,
we take a sample, calculate a
we take a sample, calculate a
statistic
statistic
related to
related to
the
the
parameter
parameter
of interest, and make an
of interest, and make an
inference.
inference.
The
The
sampling distribution
sampling distribution
of the
of the
statistic
statistic
is the
is the
tool that tells us how close is the statistic to the
tool that tells us how close is the statistic to the
parameter.
parameter.