What does a t-test do? (Why do you do one, not how do you do it in terms of calculations.)

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A Japanese inventor created a technique that can be used to discover the underlying cause of a problem or the underlying reason for a decision. This technique is called:

When calculating a t-test, if P>0.05 we reject the null hypothesis, so we are saying there is a significant difference.

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If you measure the diameter of field on high power to be 5 millimeters and 10 equally sized objects could fit across the center, how large is each object in microns (micrometers):

It is important to keep in mind that

What does a t-test do? (Why do you do one, not how do you do it in terms of calculations.)

What is a null hypothesis?