Smoking and Alzheimer’s. Medical studies indicate that smokers are less likely to develop Alzheimer’s dis-ease than people who never smoked. a) Does this prove that smoking may offer some protec-tion against Alzheimer’s? Explain. b) Offer an alternative explanation for this association.c) How would you conduct a study to investigate this?

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2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.