Answered step-by-stepQ2. A camera has been developed to detect the presence of cataract...
Q2. A camera has been developed to detect the presence of cataract more accurately. Using this camera, the gray level of each point (or pixel) in the lens of a human eye can be characterized into 256 gradations, where a gray level of 1 represents black and a gray level of 256 represents white. To test the camera, photographs were taken of 6 randomly selected normal eyes and 6 randomly selected cataractous eyes (the two groups consist of different people). The median gray level of each eye was computed over the 10,000+ pixels in the lens. The data are given in HW4 Q2.sav on Blackboard.
- What statistical procedure can be used to test whether there is a significant difference in the median gray levels between cataractous and normal eyes? Explain why using the appropriate graphs.
- Carry out the test procedure mentioned in part 1). Use α = 0.10, and both rejection region and p-value to make a decision.
- Provide a 90% CI for the mean difference in median gray levels between cataractous and normal eyes. Interpret the confidence interval.
Answer & Explanation
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