3/23/2009
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9-1 Hypothesis Testing
9-1.1 Statistical Hypotheses
Statistical hypothesis testing and confidence interval
estimation of parameters are the fundamental methods
used at the data analysis stage of a
comparative
experiment
in which the engineer is interested for
Definition
experiment,
in which the engineer is interested, for
example, in comparing the mean of a population to a
specified value.
9-1 Hypothesis Testing
9-1.1 Statistical Hypotheses
For example, suppose that we are interested in the
burning rate of a solid propellant used to power aircrew
escape systems.
•
Now burning rate is a random variable that can be
described by a probability distribution.
•
Suppose that our interest focuses on the
mean
burning
rate (a parameter of this distribution).
•
Specifically, we are interested in deciding whether or
not the mean burning rate is 50 centimeters per second.
9-1 Hypothesis Testing
9-1.1 Statistical Hypotheses
null hypothesis
alternative hypothesis
Two-sided Alternative Hypothesis
One-sided Alternative Hypotheses

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