Lymphatic lariasis is a disease caused by a parasitic worm. Complications of the disease can lead to extreme swelling and other complications. Here we consider results from a randomized experiment that compared three dierent drug treatment options to clear people of the this parasite, which people are working to eliminate entirely. The results for  the second year of the study are given below:

(a) Set up hypotheses for evaluating whether there is any dierence in the performance of the treatments, and also check conditions.

(b) Statistical software was used to run a chi-square test, which output:

Use these results to evaluate the hypotheses from part (a), and provide a conclusion in the context of the problem.

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Three drugs Two drugs Two drugs annually Clear at Year 2 Not Clear at Year 2 52 31 42 2 24 14