You would like to determine if there is a difference in the mean INR for two groups of patients that have different preferences for drinking cranberry juice. INR (international normalized ratio) is a unit-less “measurement” used to quantify the effectiveness of Warfarin, an anticoagulation drug. The first group consists of 37 patients who like to drink one glass of cranberry juice every morning. The mean INR for the cranberry juice drinkers is 1.7 with sample variance of 1.9. The second group does not drink cranberry juice and consists of 121 subjects. The non-cranberry juice drinking group has a mean INR of 1.2 with sample variance of 0.5. Assume that drinking cranberry juice and not drinking cranberry juice is the only key distinction between the groups (i.e. other dietary factors are held constant and do not effect INR).

a) Make the appropriate t-test.

b) Determine the probability of the t-test result.

c) Decide whether you would accept or reject the hypothesis of no difference between the cranberry juice drinkers and the non-cranberry juice drinkers.

Subject | Mathematics |

Due By (Pacific Time) | 05/05/2013 07:00 pm |

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