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1-Sample t-Test

Recurrence of Cancer Tumors

Unfortunately, certain kinds of tumors tend to recur. Byar and Blackard (1977) examined the rate of recurrence for bladder cancer following chemotherapy. Specifically, they recorded the time of recurrence (in months) for patients that received a placebo. Use the data in Tumors.csv (data) to determine, at the 10% level, if the mean length of tumor recurrence is greater than 27 months. Make sure to provide explicit answers with your work shown for all 11 steps of a hypothesis test.

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2-Sample t-Test

Cholesterol Drug Treatments II

The results from the study described in the 2-sample t-test class example were recorded in Cholesterol2.csv (data, meta). Use these data (note that you will need to create a variable that contains the reduction in LDL levels for each subject) and t.test() to confirm your calculations in the previous exercise.