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When bonding​ teeth, orthodontists must maintain a dry field. A new bonding adhesive has been developed...

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When bonding​ teeth, orthodontists must maintain a dry field. Anew bonding adhesive has been developed to eliminate the necessityof a dry field.​ However, there is concern that the new bondingadhesive is not as strong as the current​ standard, a compositeadhesive. Tests on a sample of 9 extracted teeth bonded with thenew adhesive resulted in a mean breaking strength​(after 24​ hours)of overbar x=5.78 Mpa and a standard deviation of s=0.41 Mpa.Orthodontists want to know if the true mean breaking strength isless than 6.35 ​Mpa, the mean breaking strength of the compositeadhesive.

A) We must assume that the sample was not random and selectedfrom a population with a highly skewed distribution.

B.)We must assume that the sample was random and selected from apopulation with a distribution that is approximately normal.

C.)We must assume that the sample was not random and selectedfrom a normally distributed population.

D).We must assume that the sample was random and selected from apopulation that is highly skewed.

Answer & Explanation Solved by verified expert
3.7 Ratings (499 Votes)
Let denote the true mean breaking strengthWe have to testVs For a small sample n 9 and for unknown population variancesince we only have the mean and    See Answer
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