Elementary Statistics: A Step-by-Step Approach with Formula Card 9th Edition

Published by McGraw-Hill Education
ISBN 10: 0078136334
ISBN 13: 978-0-07813-633-7

Chapter 8 - Hypothesis Testing - 8-3 t Test for a Mean - Exercises 8-3 - Page 449: 1

Answer

similarities: a. Both distributions are symmetric about the mean and bell shaped b. Curves of both distributions never touch zero c. Mean, median and mode are equal to 0 and located at the center of the curve Differences: a. As degrees of freedom increase, the curve approach normality b. Variance of the t-distribution is greater than 1.

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