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Using Two-way ANOVA Sales and Model, Monthly -----0--- - - 41. The compact car market in the United States is extremely competitive. Sales for six

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Using Two-way ANOVA Sales and Model, Monthly

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-----0--- - - 41. The compact car market in the United States is extremely competitive. Sales for six of the top models for six months in 2011 follow (Motor Trend, November 2, 201 1). Chevy Ford Hyundai Honda Toyota VW Month Cruze Focus Elantra Civic Corolla Jetta May 22.711 22.303 20.006 18.341 16.985 16.671 June 24.896 21.385 19.992 18.872 17.485 17.105 July 24.468 17.577 15.713 15.181 14.889 14.006 August 21.897 16.420 15.054 14,500 14.093 12.083 September 18.097 16.147 15.023 14.386 13.724 10.309 October 16.244 16.173 14,295 13.058 13.000 12,386 At the .05 level of significance, test for any significant difference in the mean number of cars sold per month for the six models

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