8th Edition

ISBN: 9780101123402

Author: Rosner

Publisher: YUZU

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Chapter 8, Problem 28P

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 Table 8.14.

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

TABLE 8.14 Median gray level for cataractous and normal eyes

Chapter 8, Problem 28P, A camera has been developed to detect the presence of cataract more accurately. Using this camera,

Definition Definition Middle value of a data set. The median divides a data set into two halves, and it also called the 50th percentile. The median is much less affected by outliers and skewed data than the mean. If the number of elements in a dataset is odd, then the middlemost element of the data arranged in ascending or descending order is the median. If the number of elements in the dataset is even, the average of the two central elements of the arranged data is the median of the set. For example, if a dataset has five items—12, 13, 21, 27, 31—the median is the third item in ascending order, or 21. If a dataset has six items—12, 13, 21, 27, 31, 33—the median is the average of the third (21) and fourth (27) items. It is calculated as follows: (21 + 27) / 2 = 24.

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Chapter 8, Problem 27P

Chapter 8, Problem 29P

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Chapter 8 Solutions

EBK FUNDAMENTALS OF BIOSTATISTICS

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Solution Summary: The author explains that the appropriate statistical procedure is used to test whether there is a significant difference in the median gray levels between cataractous and normal eyes.

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Chapter 8 Solutions