Ccollecting Data

The third step in hypothesis testing is to collect the study data. A population is defined as the entire set of individuals of interest. In our example, all the mice of line A and all the mice of line B are the populations of interest. Most of the time, it is impossible and unnecessary to collect data from the entire population in order to test a hypothesis. In practice, researchers usually collect data from a subset of the population and generalize the finding from this subset to the original population. This subset is called a sample. Ideally, the sample used for a study is a random sample, which implies that every individual in the population has an equal probability of being selected. This ensures that the sample represents the population well with respect to the variation within the population. Sampling is a complex issue that is beyond the scope of this chapter. The interested reader is referred to Thompson (2002).

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Blood Pressure Health

Blood Pressure Health

Your heart pumps blood throughout your body using a network of tubing called arteries and capillaries which return the blood back to your heart via your veins. Blood pressure is the force of the blood pushing against the walls of your arteries as your heart beats.Learn more...

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