Often, scientists like to hold all conditions constant except one. Just varying one thing at a time makes it easier to analyze the results. Select any one of the independent variables
you have listed above and design an experiment similar to Dr. Trudeau’s. State your experimental question, i. e.,
what are you trying to find out. Formulate a hypothesis. Ten decide upon and write out a description of how
you will manipulate your treatment groups (there needn’t be three; you could have two, or four—just design a
good experiment!), and then imagine the possible outcomes, assuming survival is the dependent variable. Now
generate two survival curves based on those imagined outcomes—one that supports your hypothesis and one
that does not.