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Answer :
Answer:
2.958
Step-by-step explanation:
Sample mean (x) = 38.2 MPG
Population mean (μ) = 37.9 MPG
Sample size (n) = 140
Standard deviation (σ) = 1.2
The test statistic (Tstat) can be obtained thus :
(x - μ) / σ/sqrt(n)
Tstat = (38.2 - 37.9) / 1.2/sqrt(140)
Tstat = 0.3 / 0.1014185
Tstat = 2.9580401
Test statistic = 2.958
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