HW06_QCorrected

HW06_QCorrected - STAT 350 Spring 2009 Homework #6...

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Homework #6 Page 1 of 2 STAT 350 – Spring 2009 Homework #6 Corrected through Lecture J Text Exercises Chapter 7, Problems #38, 46*, 48*, 52 * do not assume equal variance! Then answer the following problems 1. You are part of a team that has designed a new filter to be used with pitchers for drinking water. You need to study how effective it is at removing various contaminants. You have 12 1-gallon pitchers fitted with new filters. You have a supply of water spiked with a high concentration of copper. You add 1 gallon of water to each pitcher, then measure the amount of copper removed. The average copper removed was 72.8 ppb (parts per billion) with a standard deviation of 18.6 ppb. a. Give a 90% CI for the true mean copper removed by these filters from the first gallon of water. b. Give a 95% CI for the true mean copper removed by these filters from the first gallon of water. c. Give a 99% CI for the true mean copper removed by these filters from the first gallon of water. d. Assume you have a 13
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HW06_QCorrected - STAT 350 Spring 2009 Homework #6...

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