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Unformatted text preview: Math 127B, Notes for lecture 11 Mrinal Raghupathi Monday, February 28th, 2011 Administrivia Today we will discuss tests of significance. Reminders 1. Homework 7 is due Thursday, 3/17 in recitation. 2. Quiz in recitation over chapter 26 on 3/17. 3. This weeks recitation will be a discussion of problems from chapter 26. 1 What is a test of significance? A test of significance is used to test a claim about a population parameter. Examples of parameters could be the average number of credit hours taken by freshmen, the average GPA and a certain university, the average rainfall in Nashville in the month of February, the amount of sugar in chocolate, or the the time taken to service a maintenance request. A test of significance involves formulating a null hypothesis, which is a claim about the popu lation parameter. All the examples we will look at will be formulated in terms of a box model. So our null hypotheses will be claims about a box. Our data will usually indicate a suitable alternative hypothesis. We will study three tests of significance in the next three weeks. 1. Tests for averages or percentages. There are two test statistics, the ztest, and the ttest. 2. Tests for the difference of two averages. Tests like are used to determine whether two popu lations are different. For example are high school dropout rates different in Tennessee and Kentucky. 1 3. Tests for goodnessoffit. The 2test ( is the Greek letter chi, rhymes with tie) will be our focus. These tests determine whether observations fit a certain model, i.e., do the observations come from a specified box....
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This document was uploaded on 10/29/2011 for the course MATH 127B at Vanderbilt.
 Spring '11
 Staff
 Math, Statistics

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