A Major US

question 30

Essay

A major U.S. oil company has developed two blends of gasoline. Managers are interested in determining whether a difference in mean gasoline mileage will be obtained from using the two blends. As part of their study, they have decided to run a test using the Chevrolet Impala automobile with automatic transmissions. They selected a random sample of 100 Impalas using Blend 1 and another 100 Impalas using Blend 2. Each car was first emptied of all the gasoline in its tank and then filled with the designated blend of the new gasoline. The car was then driven 200 miles on a specified route involving both city and highway roads. The cars were then filled and the actual miles per gallon were recorded. The following summary data were recorded: Based on the sample data, using a 0.05 level of significance, what conclusion should the company reach about whether the population mean mpg is the same or different for the two blends? Use the p-value approach to test the null hypothesis.

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Definitions:

Posttraumatic Stress Disorder

A mental health condition triggered by experiencing or witnessing a severely traumatic event, characterized by flashbacks, nightmares, and severe anxiety.

Post-Traumatic Stress Disorder (PTSD)

A disorder characterized by failure to recover after experiencing or witnessing a terrifying event, leading to symptoms such as flashbacks, nightmares, and severe anxiety.

Major Stressor

Any significant event or situation that causes a high level of stress or change in one's life.

Obsession

An intrusive and persistent thought, urge, or image that causes distress and can interfere with normal functioning.