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A researcher had just completed a quasi-experimental study comparing the difference in thigh high vs knee high TED hose in preventing DVT. After all the data were put in the computer, the researcher discovered that 10 subjects had dropped out of the study in the knee high group and no subjects in the thigh high group left the study. Which threat to internal validity is this? 1) Selection bias 2) history 3) testing 4) Mortality
Sagot :
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