Question

In a randomized trial, 174 women with breast cancer were assigned to receive chemotherapy. Another 164 women were assigned to receive chemotherapy combined with radiation therapy. Survival data after 15 years is given below:

	Chemotherapy only	Chemo and radiation
Survived	86	66
Died	88	98

a) (1 pt) What is the appropriate test for testing the hypothesis that the treatment type does not affect survival rate?

b) (6pts) Perform the test for the hypothesis that the type of treatment does not affect survival rate. Use α=0.05. Clearly state the null and alternative hypothesis, and your conclusion. (Hint: complete the 2 x 2 table with expected counts and group totals, first)

Answer 1

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