Below is a comparative boxplot for two groups of patients who suffer from Parkin

Question

Below is a comparative boxplot for two groups of patients who suffer from Parkinson’s disease. One group of a patients underwent surgery (Op) and the other group did not (NoOp). Afterwards both groups were given speech tests to evaluate how well they speak. For this test a higher score indicates MORE difficulty speaking. a. Compare and contrast the distribution of the two groups of Parkinson’s patients. [8 pts.] b. Are any outliers indicated by the boxplots? How can you tell? [3 pts.] c. Based on these boxplots do you think the surgery is an effective way to improve the speech of Parkinson’s patients? Why or why not? [4 pts.]

Explanation / Answer

Answers to the question:

a. Compare and contrast the distribution of the two groups of Parkinson’s patients. [8 pts.]

The group with operation has a higher score than group without operation. The group with operation is normally distribution and is not skewed, but the distribution of group without operation is right .positive skewed.

b. Are any outliers indicated by the boxplots? How can you tell? [3 pts.]

No, there are no outliers indicated in the boxplot.

c. Based on these boxplots do you think the surgery is an effective way to improve the speech of Parkinson’s patients? Why or why not? [4 pts.]

No. Since the distribution of boxplot clearly indicates that with operations people have on average more diffculty in speaking. SURGERY is NOT the effective way to improve the speech of Parkinson'' patients.

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