Two limitations of a t-test are you can only use one factor at a time and you can only use two levels at a time. You have to watch out for the Type 1 error because it increases with simultaneous tests.
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scope and lim;tation of statics
Never? Avoid thinking in absolutes. It is much better to understand published statistics but impossible to say "never safe to ...".
The two main branches of statistics is Descriptive statistics and inferential statistics.
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