assata2008 assata2008

20-01-2024
Mathematics

Answered

An automobile manufacturer claims that the average city MPG of one model of car that the manufacturer produces is μ = 30 mpg. A SRS of n = 40 of these model cars subjected to the same conditions reveals that x-bar = 28 mpg and s = 2.23 mpg. Is there convincing evidence at α = 0.05 that the company has exaggerated this claim? The test statistic calculated from this sample data is:

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