Enjoy learning Statistics Online! Please be sure to share and subscribe to our YouTube channel.

**ASK THE PROFESSOR FORUM**

Course Documents

Chapter 1 - Intro

Chapter 2 - Methods for Describing Sets of Data

Chapter 3 - Probability

Chapter 4 - Discrete Random Variables

Chapter 5 - Normal Random Variables

Chapter 6 - Sampling Distributions

Chapter 7 - Confidence Intervals

Chapter 8 - Tests of Hypothesis: One Sample

Chapter 9 - Confidence Intervals and Hypothesis Tests: Two Samples

Sample Exam I: Chapters 1 & 2

Sample Exam II: Chapters 3 & 4

Sample Exam III: Chapters 5 & 6

Sample Exam IV: Chapters 7 & 8

Lecture Examples

**Example 130.5:**** A researcher wants to test the claim that the mean happiness score for married couples is greater than 2.5 on a three point scale **(1 = *not very happy*,2 = *pretty happy*, 3 = *very happy*). **The significance level for the test is 0.01.**

**What is the probability of the type one error?**

**If the p-value for the test turned out to be 0.0004, what is the initial conclusion? What possible error (type I or II) could have been committed after forming that conclusion?**

**If the p-value for the test turned out to be 0.0301, what is the initial conclusion? What possible error (type I or II) could have been committed after forming that conclusion?**