An automobile company is looking for fuel additives that might increase gas mileage. Without additives 17 their cars are known to average 17 mpg (miles per gallons)with a standard deviation of mpg on 6 a road trip from Muscatto Sur. The company now asks whether a new additive increases this value. In a study, forty cars are sent on a road trip from Muscat to Sur. Suppose it turns out that the forty cars average x - (17 + 0.75)mpg with the additive.Can we conclude from this result that the additive is effective? a. With a significance level of 5%. b. With a significance level of 1%

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An automobile company is looking for fuel additives that might increase gas mileage. Without additives
17
their cars are known to average 17 mpg (miles per gallons)with a standard deviation of
mpg on
6
a road trip from Muscatto Sur. The company now asks whether a new additive increases
this value. In a study, forty cars are sent on a road trip from Muscat to Sur. Suppose it turns out that the
forty cars average x
- (17 + 0.75)mpg with the additive.Can we conclude from this result that
the additive is effective?
a. With a significance level of 5%.
b. With a significance level of 1%
Transcribed Image Text:An automobile company is looking for fuel additives that might increase gas mileage. Without additives 17 their cars are known to average 17 mpg (miles per gallons)with a standard deviation of mpg on 6 a road trip from Muscatto Sur. The company now asks whether a new additive increases this value. In a study, forty cars are sent on a road trip from Muscat to Sur. Suppose it turns out that the forty cars average x - (17 + 0.75)mpg with the additive.Can we conclude from this result that the additive is effective? a. With a significance level of 5%. b. With a significance level of 1%
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