4. Standard Deviation and Variance Is a test of the claim that s 5 2.00 equivalent to a test of the claim that s2 5 4.00? When testing the claim that s 5 2.00, do you use a different test statistic than the one used for testing the claim that s2 5 4.00?

Finding Test Components. In Exercises 5–8, calculate the test statistic, then use Table A-4 to find critical value(s) of x2, then use Table A-4 to find limits containing the P-value, then determine whether there is sufficient evidence to support the given alternative hypothesis.

5. H1:

6. H1:

7. H1:

8. H1:

Testing Claims About Variation. In Exercises 9–20, test the given claim. Assume that a simple random sample is selected from a normally distributed population. Use the traditional method of testing hypotheses unless your instructor indicates otherwise.