qt(0.09 / 2, 5, lower.tail = FALSE)
##[1] 2.097837
From ?qt
:
lower.tail: logical; if TRUE (default), probabilities are P[X <= x],
otherwise, P[X > x].
Pregunta
for the question: If T has the Student's t distribution with 5 degrees of freedom, find t so that 2*P(T > t) = 0.09
I basically tried all of the following and the answer is wrong. I am not yet really so connected with the R syntax and don't know how to use qt
. Any idea?
> 1-qt(0.045,5)
[1] 3.097837
> qt(0.045,5)
[1] -2.097837
> 1-qt(0.09,5)
[1] 2.557869
Solución
qt(0.09 / 2, 5, lower.tail = FALSE)
##[1] 2.097837
From ?qt
:
lower.tail: logical; if TRUE (default), probabilities are P[X <= x],
otherwise, P[X > x].