Suppose the average fuel consumption of a SUV manufactured at an automobile plant in Windsor is 12.9

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Suppose the average fuel consumption of a SUV manufactured at an automobile plant in Windsor is 12.9 L/100 km in city. The average fuel consumption (in L/100 km) for seven randomly selected SUVs is 13.5, 13.0, 12.6, 12.2, 12.8, 12.9, and 13.1. Assume that the distribution of fuel consumption distribution is normal. Do the data provide sufficient evidence to indicate the average fuel consumption is less than 12.9 L/100 km? Test using a = 0.10.

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