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Fig. 3.4
Result of Using the TINV Function to Find the Conﬁdence Interval About the Mean

3.2 Hypothesis testing

One of the important activities of research scientists is that they attempt to “check”

their assumptions about the world by testing these assumptions in the form of

hypotheses.

A typical hypothesis is in the form
: “If x , then y.”

Some examples would be:

1. “If we use this new method fertilizing the soil, the corn yield of the plot will

increase by 3 percent.”

2. “If we use this new method of teaching science to ninth graders, then our science

achievement scores will go up by 5 percent.”

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