When bonding teeth, orthodontists must maintain a dry field. A now bonding adhes

Question

When bonding teeth, orthodontists must maintain a dry field. A now bonding adhesive has been developed to eliminate the necessity of a dry feld. However, there is concern that the new bonding achesive is not as srong as the current standard, a composite adhesive. Tests on a sample of 8 extracted teeth bonded with the new adhesive es bed n a mean b eaking strengt (8 e 24 hours o x-5.9 MDA and 8 standar de to c 8 033 a Ortodontists art to know if the tre mean b eeking srength 8 less then 6.49 Mpa the mean brea ong stren of the co o site adhesive. a. Set up the nuil and ahernative hypotheses for the test. Choose the correct answer below OD· Ho:p2649 vs. Ha :

Explanation / Answer

The statistical software output for this problem is:

One sample T summary hypothesis test:
: Mean of population
H0 : = 6.49
HA : < 6.49

Hypothesis test results:

Hence,

a) Null and Alternative Hypotheses: Graph F is correct. [Note - If F is not correct, mark D]

b) t < -2.998; Option G is correct.

c) t = -4.54

d) Option A is correct.

e) We must assume that the sample was random and selected from the population that is normally distributed.

Option B is correct.

Mean Sample Mean Std. Err. DF T-Stat P-value 5.96 0.11667262 7 -4.5426254 0.0013

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