Lecture_14 (short)

2 as the degrees of freedom k increase the t

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

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 distribution. (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. Applet: http:// demonstrations.wolfram.com/ 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? Rafael Mendoza 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)...
View Full Document

This document was uploaded on 02/19/2014 for the course STA 309 at University of Texas.

Ask a homework question - tutors are online