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=Geog306, Spring 2008
Assignment 5
Due: April 3, 2007
Significance Tests
Answer Sheet:
include your hypotheses, your pvalue, and a properly labeled curve.
Make sure to write down your major/concentration.
Hint: watch for small sample sizes.
1.
Mean annual water consumption per household in a certain city is 6800 L. The variance is
1,440,000. A random sample of 40 households in one neighborhood reveals a mean of 5500 L.
Test the hypothesis that this neighborhood has lower water usage than the rest of the city with a
0.05 level of significance. Use a classical hypothesis test.
Population mean = 6800 sample mean = 5500 variance = 1440000 alpha = 0.05
H0 :
2.
An industrial plant claims to discharge no more than 1000 gallons of wastewater per hour, on the
average, into a neighboring lake. Monitoring the discharge is very expensive and only a very
small sample is possible. A random sample of four hours is selected over a week. The
observations were 2000, 1000, 3000, and 2000 gallons. Test the hypothesis that the company is
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 Spring '08
 YEO

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