When bonding to orthodontistain a dryf Anew bonding adhesive has been developed to me theme of dry However there is not
Posted: Mon Apr 11, 2022 6:27 am
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 concern that the new bonding adhesive is not as strong as the current standard, a composite adhesive Tests on a sample of 11 extracted teeth bonded with the new adhesive resulted in a mean breaking strength (after 24 hours) of x = 4 63 Mpa and a standard deviation of s = 0.34 Mpa. Orthodontists want to know if the true mean breaking strength is less than 5.15 Mpa, the mean breaking strength of the composite adhesive. a. Set up the null and alternative hypotheses for the test Choose the correct answer below. O A. Ho H=515 vs. H. H> 5.15 OC. Ho 25.15 vs. Ha u<5.15 O E. Ho - 463 vs. H. H<463 OB. Ho H=5,15 vs H, ยป#515 OD. Ho u=463 vs H, 174.63 OF. Ho H=5.15 vs. H. <5.15 b. Find the rejection region for the test using a=0 05 Choose the correct answer below. O A. 1.812 od -2.228 O E t - 1.812 O G. > 1.812 OB. t< - 1.812 OD. > -2.228 OF. t<2.228 OH. > 2.228 C. Compute the test statistic t EH (Round to two decimal places as needed) d. Give the appropriate conclusion for the test. Choose the correct answer below. O A. Reject Ho There is insufficient evidence to indicate u <5.15 Mpa O B. Do not reject Ho There is insufficient evidence to indicate p < 5.15 Mpa. OC. Reject Ho There is sufficient evidence to indicate u <5.15 Mpa OD. Do not reject Ho There is sufficient evidence to indicate u <5 15 Mpa.
e. What conditions are required for the test results to be valid? O A. We must assume that the sample was random and OB. We must assume that the sample was not random selected from a population with a distribution that is and selected from a population with a highly skewed approximately normal distribution O C. We must assume that the sample was not random OD. We must assume that the sample was random and and selected from a normally distributed population selected from a population that is highly skewed.