Posted by **Anonymous** on Sunday, July 18, 2010 at 6:50pm.

how to know exact t value using sample standard deviation and sample mean and sample size

i think df is sample size -1 .

we usually use approx value but to use exact value how to use t score table.

and how we conclude whether it is two tailed test or one tailed test .

(i f the problem asks for exact increase or decrease ,is it one tailed test ,i guess so ,)

please clarify my doubts

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