Question

19. A dentist wants to know if toothpaste flavor affects the number of cavities that develop in children. She creates four types: flavorless, cherry, bubblegum, and spinach. She divides her sample of 44 children into 4 groups of 14 and gives each group a different flavor toothpaste.

a) Using proper symbols, provide the omnibus Null Hypothesis.

After collecting her data and performing a one-way between-subjects ANOVA, the researcher wrote the following summary statement. "The mean number of cavities varied significantly across the 4 toothpaste groups, F(3,40) = 6.62, MSe = 2.20, p < .05" Based on this statement, fill in the missing values in the ANOVA summary table below.

b) ANOVA on number of cavities

Source	SS	df	MS	F	D
Toothpaste
error
total

c) Based on these ANOVA results, what do these results mean? Provide you logical interpretation, not just a restatement of the summary statement.

d) What would you recommend the dentist to do next?

Answer 1