Sunny Srivastava wrote:
Hi Huaru,
Are you sure you are looking at 0.95 and NOT 0.975?
as qt(0.975,9) = 2.262
generally tables are given for alpha/2 (alpha=0.05 in your case)
significance.
Please check carefully.
Or, put differently, tables are often given for two-sided p-values
(especially in the back pages of textbooks), whereas qt() is for one-sided.
I.e. the t distribution with 9 DF has a probability of 0.95 of falling
BELOW 1.833 but also of falling BETWEEN -2.262 and +2.262.
--
O__ ---- Peter Dalgaard Øster Farimagsgade 5, Entr.B
c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K
(*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalga...@biostat.ku.dk) FAX: (+45) 35327907
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