Transcript 9.4 Power Point

Chapter 9: Hypothesis
Testing
Section 4: Tests involving the
Mean (Small Samples)
Example

A company manufactures large rocket
engines used to project satellites into space.
A contract specifies that these engines are
to use an average of 5500 pounds of rocket
fuel for the first 15 seconds of operation.
The company claims that its engines fit
specifications. To test the claim, an
inspector randomly selects six engines. The
mean fuel consumption is found to be 5690
pounds with a standard deviation of 250
pounds. Test at the 5% level of
significance.