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How to operationally define IV and DV

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I need to figure how to operationally define my independent variable (IV), dependent variable (DV), null hypothesis, and alternative hypothesis. Here is the information:

A medical researcher tests the effectiveness of new cancer medication on a sample of 1000 cancer patients. Half of the subjects are randomly assigned to the treatment group and half are randomly assigned to the control (placebo) group. Test to see if the if the 5-year mortality (death) rate in the treatment group differs significantly from the mortality rate of the control group. Set alpha at 1%.

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Solution Summary

The independent and dependent variables have been defined in the solution. Also, the null and alternative hypotheses are stated.

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The independent variable is the treatment given to the treatment group. The dependent variable is the

mortality ...

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