Confidence Intervals - HP 50g User Manual

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Confidence intervals

Statistical inference is the process of making conclusions about a population
based on information from sample data. In order for the sample data to be
meaningful, the sample must be random, i.e., the selection of a particular
sample must have the same probability as that of any other possible sample out
of a given population. The following are some terms relevant to the concept of
random sampling:
Population:
attribute of a component.
Sample: sub-set of a population.
Random sample: a sample representative of the population.
Random variable: real-valued function defined on a sample space. Could
be discrete or continuous.
If the population follows a certain probability distribution that depends on a
parameter , a random sample of observations (X
can be used to estimate .
Sampling distribution: the joint probability distribution of X
A statistic: any function of the observations that is quantifiable and does not
contain any unknown parameters. A statistic is a random variable that
provides a means of estimation.
produce scattergram of y vs. x
show line for log fitting
collection of all conceivable observations of a process or
,X ,X ,... , X ), of size n,
1 2 3 n
,X ,X
1 2 3
,... , X .
n
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