A dental study evaluated the effect of tooth etch time on resin bonding strength

Question

A dental study evaluated the effect of tooth etch time on resin bonding strength. A total of 78 undamaged, recently extracted first molars (baby teeth) were randomly assigned to be etched with phos- phoric acid gel for either 15, 30, or 60 seconds. Composite resin cylinders of identical size were then bonded to the tooth enamel. The researchers examined the bond strength after 24 hours by find ing the failure load (in megapascals) for each bond. Here are the summary data and ANOVA table for this experiment: .9 Etch time 15 seconds 26 4.49 2.28 30 seconds 26 6.98 3.15 60 seconds 26 8.484.17 DF MS Source Etch time 2 211.208 105.604 9.745 0.0002 BrroI Total 75 812.745 10.837 77 1023.953 Exercises 24.18 to 24.24 are based on this study.

Explanation / Answer

b) inaccurate because the population must be Normally distributed for ANOVA.

To use the ANOVA test following assumptions should be satisfy:

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