Chapter 9.docx - Chapter 9 Hypothesis Testing for a Single Population Kelly Kayser What is a hypothesis An assumption about a specific population

# Chapter 9.docx - Chapter 9 Hypothesis Testing for a Single...

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Chapter 9: Hypothesis Testing for a Single Population Kelly Kayser What is a hypothesis? An assumption about a specific population parameter. The mean, standard deviation, and proportion are examples of what is being assumed. What are the 2 hypotheses? 1. H 0 : Null 2.H 1 : Alterative Which hypothesis is tested (believed to be true)? null Which hypothesis are we trying to prove to be true? Alternative The = (=, <=, or >=) always goes in the null hypothesis. In the wall street journal example in your textbook where we are testing the status quo that Internet users spend an average of 56 seconds on a webpage there are three valid hypothesis tests we could conduct: Test (insert the symbols) Two-tailed, Upper Tailed, or Lower Tailed? Ho: u = 56 H1: u =/= 56 Two-tailed This test would be used by someone that wants to prove that the average is a lot higher or a lot lower than 56. Ho: u <= 56 H1: u > 56 One-tailed This test would be used by someone that wants to prove that the average is higher than 56.

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• Spring '13
• Tyler
• Statistical hypothesis testing