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1. Put the example of the cereals in the framework of the scientific method, elaborating on each of the six steps.

2. State a null and alternative hypotheses for the example of the file cards in Section 1.1,

3. In the Salk experiment described in of Section 1.1:

a. Why should Salk not be content just to reject the null hypothesis?

b. What conclusion could be drawn from the experiment?

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