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1998 Postgraduate Mathematics Question 15.
This question is a classic, and I have studied it for a long time.

Review the specific meaning of the T distribution (area on the right) given in the book, because all the statistics given in the book are based on this distribution.

There is also the T distribution given in the title (the area is on the left). How to connect these two areas is actually very simple, as long as the two areas want to add up to 1.