(Question 1) What statistical procedure can be used to test whether there is a s

Question

(Question 1)
What statistical procedure can be used to test whether there is a significant difference in the median gray levels between cataractous and normal eyes?

(Question 2)
Carry out the test procedure mentioned in 8.28, and report a p-value.

(Question 3)
Provide a 99% CI for the mean difference in median gray levels between cataractous and normal eyes.

Table 8.14 Median sray level for cataractous and nornal eves Patient number Cataractous median gray level Normal median gray level 161 140 136 158 182 185 145 167 106 149 Mean: x 143.8 22.7 169.0 15.4

Explanation / Answer

Question 1 :

Mann-whitney test

Question 2 :

The Z-score = -1.841

P-value = 0.06576

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