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THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION:
An instructor in an economics class is considering three different texts.She is also considering three types of examinations-multiple choice,essays,and a mix of multiple choice and essays.During the year she teaches nine sections of the course and randomly assigns a text - examination type combination of each section.At the end of the course she obtained students' evaluations for each section.These ratings are shown in the accompanying table.
-Test the null hypothesis of equality of population mean ratings for the three texts.Use α = 0.05.
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Lubricants made from chemical compounds providing superior protection and performance over traditional oils in gearbox applications.
Mineral-Based Lubricants
Lubricants derived from mineral oils used to reduce friction and wear in machinery and engines.
Lubricity
The property of a substance that reduces friction between surfaces in motion.
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The temperatures at which liquids change to gases, varying with the atmospheric pressure and the chemical composition of the liquid.
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