Question: When bonding teeth, orthodontists must maintain a dry field. A new bonding adhesive has been developed to eliminate the necessity of a dry field. However,

When bonding teeth, orthodontists must maintain a dry field. A new bonding adhesive has been developed to eliminate the necessity of a dry field. However, there is a concern that the new bonding adhesive is not strong as the current standard, a composite adhesive. Tests on a sample of 9 extracted teeth bonded with the new adhesive resulted in a mean breaking strength (after 24 hours) .62 mpa and the standard deviation of s= .45 Mpa. Orthodontists want to know if the true mean breaking strength is less than 5.20 Mpa, the mean breaking strength of the composite adhesive

Compute the test statistic.

Find the rejection region for the test using .05.

What is the null and alternative hypotheses for the test?

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