find the value of t such that the area under the curve between -t and t equals 0.9. Assume the degrees of freedom equals 23
Here we need to find:
-t.inv ( p = 0.05 , df = 23 ) = 1.71.
(This is because to have 90% of the range between -t and t, t needs to be at p=0.05 and p=0.95).
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