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Unformatted text preview: ormal vs. t-distribution McCombs Properties of the t distributions - continued
Q.2 As the degrees of freedom (k)
increase, the t distribution moves
. . . . . . the Standard Normal
(a) farther away from
(b) closer to
Correct answer: closer to Normal vs. t-distribution Recall d.f. = k = n − 1, as n
increases the CLT ensures that the
distribution with σ < ∞ tends to
the normal distribution.
ComparingNormalAndStudentsTDistributions/ Rafael Mendoza
Elementary Business Statistics – Class 14 McCombs Calculating critical t-values What is t∗ for a 95% conﬁdence interval if the sample size is 5?
Elementary Business Statistics – Class 14 McCombs Using TINV function
t∗ =TINV(probability, degfreedom) where t-Inverse: returns t∗ such that
P (|t| > t∗ ) = (1 − C ) probability: total probability we
want in both tails (for a 95% CI,
it is 0.05)...
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This document was uploaded on 02/19/2014 for the course STA 309 at University of Texas.
- Fall '07