ECON 221 Lecture 10: Lecture 10 10/25 and 10/27
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1 Nov 2016
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The manufacturing specification for a particular variety of copper wire indicates that the process standard deviation of the wire diameter should not exceed .005 inches. A random sample of 20 wires reveals a sample standard deviation of .006 inches. The researcher is interested in finding evidence at the .05 level that the process standard deviation is exceeding the specification limit.
Which of the following pairs of hypotheses accurately reflects the question of interest?
a. | H0: ?=.005 HA: ??.005 | |||||||||||||||||||||||||||||||||||||||||||||||||
b. | H0: p?0.005 HA: p<0.005 | |||||||||||||||||||||||||||||||||||||||||||||||||
c. | H0: ??.005 HA: ? >.005 | |||||||||||||||||||||||||||||||||||||||||||||||||
d. | H0: ??.005 HA: ?>.005 | |||||||||||||||||||||||||||||||||||||||||||||||||
e. | H0: ?=.005 HA: ??.005 Which of the following is the correct value of the test statistic?
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