Chapter 22

# Chapter 22 - Chapter 22(Student What Is A Test of...

This preview shows pages 1–3. Sign up to view the full content.

Chapter 22 (Student) 1 What Is A Test of Significance? • Inferential Technique: Hypothesis Testing (Test of Significance) • We want to test a hypothesis (statement) about the value of a parameter based on sample data. • Statistical Hypotheses are statements about population parameters. • Example: The proportion of all USC students from South Carolina is greater than 0.71. Hypothesis Testing • In statistics, we test one hypothesis against another. • Null Hypothesis , H 0 : The claim being tested in a statistical test. Usually a statement of “no effect” or “no difference.” – The null hypothesis is assumed true during the test. • Alternative Hypothesis , H a : The claim we hope or suspect is true. The claim we want to prove. Hypothesis Testing • We conduct a hypothesis test under the assumption that H 0 is true and the claim we believe, H a , is not true. • The test is designed to assess the strength of the evidence against H 0 . •H 0 and H a are statements about the population and are stated in terms of a population parameter.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Chapter 22 (Student) 2 Hypothesis Testing • The null hypothesis is usually stated so as to specify an exact value of the parameter (“no effect” or “no difference”). H 0 : p = c • The alternative hypothesis allows for the possibility of several values. – One-sided alternative H a : p < c or H a : p > c – Two-sided alternative H a : p c (where c is some real value) Example • We believe that the true proportion of all USC students from South Carolina is greater than 0.71.
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### Page1 / 5

Chapter 22 - Chapter 22(Student What Is A Test of...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online