420Hw09 - STAT 420 (10 points) (due Friday, April 11, by...

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STAT 420 Spring 2008 Homework #9 (10 points) (due Friday, April 11, by 4:00 p.m.) 1. The friendly folks at the Internal Revenue Service (IRS) are always looking for ways to improve the wording and format of its tax return forms. Three new forms have been developed recently. To determine which, if any, are superior to current form, 120 individuals were asked to participate in an experiment. Each of the three new forms and the currently used form were filled out by 30 different people. The amount of time (in minutes) taken by each person to complete the task was recorded and stored in columns 1 through 4 (forms Form1 through Form4, respectively) in file Hw09_1.csv. The data set is available at http://www.stat.uiuc.edu/~stepanov/Hw09_1.csv a) Test for differences in average time required to fill these four forms using the ANOVA F test. (i) Specify the null and the alternative hypotheses. (ii)
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This note was uploaded on 02/10/2009 for the course STAT 420 taught by Professor Stepanov during the Spring '08 term at University of Illinois at Urbana–Champaign.

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420Hw09 - STAT 420 (10 points) (due Friday, April 11, by...

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