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A2 - PUBH 7430 Assignment 2 Due at the beginning of class...

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PUBH 7430 Assignment 2 September 29, 2011 Due: October 11, 2011 at the beginning of class UPDATED: October 5, 2011 On this assignment, as in all homeworks, UNEDITED COMPUTER OUTPUT IS NOT ACCEPTABLE . Tables and plots prepared from statistical output should be appro- priate for inclusion in a scientific report, with all statistics rounded to a reasonable number of significant digits. Background This data set is on dental caries (tooth decay) caused by mutans streptococci (MS). 151 persons with gum disease (elevated oral MS levels) were recruited into a study at a mid-western research university and randomly assigned to one of three treatment groups. The treatment under study was a gum with an active drug (Xylitol). There were two control groups: one group received gum with Sorbitol but no Xylitol and one group received no gum. Participants in the gum groups were asked to chew the gum three times daily for a minimum of 5 minutes each time and carry out their usual oral hygiene (tooth brushing, mouthwash, etc.). Participants in the group without gum were asked to carry out their usual
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