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It is believed that when cars go faster, their fuel consumption change. A car company randomly...

It is believed that when cars go faster, their fuel consumption change. A car company randomly assigned cars to go with 120 km/h or 90 km/h, then measured their fuel consumption. The 180 cars that went with 120 km/h had a mean fuel consumption of 9 liters, with a standard deviation of 0.3 liters. The 240 cars that went with 90 km/h had a mean fuel consumption of 7 liters, with a standard deviation of 0.4 liters. Compute a 99% confidence interval estimate for the difference between the population means?WE SHOULD USE T OR Z?WHY?)

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