# Question

Refer to the Trends in Biomaterials & Artificial Organs (January 2003) study of a new bonding adhesive for teeth called "Smartbond," presented in Exercise. Recall that tests on a sample of 10 extracted teeth bonded with the new adhesive resulted in a mean breaking strength (after 24 hours) of x = 5.07 Mpa and a standard deviation of s = .46 Mpa. In addition to requiring a good mean breaking strength, orthodontists are concerned about the variability in breaking strength of the new bonding adhesive.

a. Set up the null and alternative hypothesis for a test to determine whether the breaking strength variance differs from .5 Mpa.

b. Find the rejection region for the test, using α = .01.

c. Compute the test statistic.

d. Give the appropriate conclusion for the test.

e. What conditions are required for the test results to be valid?

a. Set up the null and alternative hypothesis for a test to determine whether the breaking strength variance differs from .5 Mpa.

b. Find the rejection region for the test, using α = .01.

c. Compute the test statistic.

d. Give the appropriate conclusion for the test.

e. What conditions are required for the test results to be valid?

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