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Diabetic versus nondiabetic; asthmatic versus nonasthmatic

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1. The table below summarizes results from an experiment in which subjects were classified as diabetic or nondiabetic and then given a treatment. After the treatment, they were again classified as diabetic or nondiabetic. Which combinations of before treatment/after treatment categories will yield discordant pairs?

Before Treatment
Diabetic Nondiabetic
After Treatment Diabetic 9 6
Nondiabetic 22 12

A. Only diabetic/nondiabetic
B. Nondiabetic/nondiabetic and diabetic/diabetic
C. Diabetic/nondiabetic and nondiabetic/diabetic
D. Only nondiabetic/nondiabetic

2. The table below summarizes results from an experiment in which subjects were classified as asthmatic or nonasthmatic and then given a treatment. After the treatment, they were again classified as asthmatic or nonasthmatic. How many subjects were included in the experiment?

Before Treatment
Asthmathic Nonasthmatic
After Treatment Asthmathic 9 2
Nonasthmatic 15 6

A. 15
B. 32
C. 8
D. 24

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Diabetic versus non-diabetic and asthmatic versus non-asthmatic patients are examined.

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