Listed below are measured amounts of greenhouse gas emissions from cars in three different categories. The measurements are in tons per year, expressed as CO2 equivalents. Use a 0.05 significance level to test the claim that the different car categories have the same mean amount of greenhouse gas emissions. Based on the results, does the number of cylinders appear to affect the amount of greenhouse gas emissions?

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Four cylinder 7.2 7.9 6.8 74 6.5 6.6 6.7 6.5 6.5 7.1 6.7 5.5 7.3 Six cylinder 8.7 7.7 7.7 8.7 8.2 9.0 9.3 7.4 7.0 7.2 7.2 8.2 Eight cylinder 9.3 9.3 9.3 8.6 8.7 9.3 9.3