Scientists are working to train dogs to smell cancer, including early stage cancer that might not be detected with other means. In previous studies, dogs have been able to distinguish the smell of bladder cancer, lung cancer, and breast cancer. Now, it appears that a dog in Japan has been trained to smell bowel cancer.1 Researchers collected breath and stool samples from patients with bowel cancer as well as from healthy people. The dog was given five samples in each test, one from a patient with cancer and four from healthy volunteers. The dog correctly selected the cancer sample in 33 out of 36 breath tests and in 37 out of 38 stool tests. 1‘‘Dog Detects Bowel Cancer,” CNN Health Online, January 31, 2011. (a) Make a two-way table displaying the results of the study. Include the totals. Breath test Stool test Total Selects cancer Does not select cancer Total (b) Round your answers to the following questions to one decimal place. What percentage of the breath samples did the dog get correct? % What percentage of the stool samples did the dog get correct? % (c) Of all the tests the dog got correct, what percentage were stool tests?

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Chapter 2, Section 1, Exercise 022bcd

Can Dogs Smell Cancer?

Scientists are working to train dogs to smell cancer, including early stage cancer that might not be detected with other means. In previous studies, dogs have been able to distinguish the smell of bladder cancer, lung cancer, and breast cancer. Now, it appears that a dog in Japan has been trained to smell bowel cancer.¹ Researchers collected breath and stool samples from patients with bowel cancer as well as from healthy people. The dog was given five samples in each test, one from a patient with cancer and four from healthy volunteers. The dog correctly selected the cancer sample in 33 out of 36 breath tests and in 37 out of 38 stool tests.

¹‘‘Dog Detects Bowel Cancer,” CNN Health Online, January 31, 2011.

(a) Make a two-way table displaying the results of the study. Include the totals.

	Breath test	Stool test	Total
Selects cancer
Does not select cancer
Total

(b) Round your answers to the following questions to one decimal place.

What percentage of the breath samples did the dog get correct?

%

What percentage of the stool samples did the dog get correct?

%

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