Fifteen SmartCars were randomly selected and the highway mileage of each was noted. The analysis yielded a mean of 47 miles per gallon and a standard deviation of 5 miles per gallon. Which of the following would represent the tabled value we should use when creating a 95% confidence interval for the average highway mileage of all SmartCars? 1. 753 Ο 1.96 1. 645 2. 145
Added by Juan Jos- L.
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The degrees of freedom are $n-1 = 15-1 = 14$. For a 95% confidence interval, the alpha level is $\alpha = 1 - 0.95 = 0.05$. Show more…
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Fifteen SmartCars were randomly selected and the highway mileage of each was noted. The analysis yielded a mean of 47 miles per gallon and a standard deviation of 5 miles per gallon. Which of the following would represent the tabled value we should use when creating a 95% confidence interval for the average highway mileage of all SmartCars? 0 1.761 1.645 1.753 2.145
Qudsiya A.
Fifteen Smart Cars were randomly selected and the highway mileage of each was noted. The analysis yielded a mean of 47 miles per gallon and a standard deviation of 5 miles per gallon. Which of the following would represent a 90% confidence interval for the average highway mileage of all Smart Cars? Select one: 47 ± 1.345 ∕ (5 ∕ √15) 47 ± 1.645 ∕ (5 ∕ √15) 47 ± 1.753 ∕ (5 ∕ √15) 47 ± 1.761 ∕ (5 ∕ √15)
David N.
Fifteen SmartCars were randomly selected and the highway mileage of each was noted. The analysis yielded a mean of 47 miles per gallon and a standard deviation of 5 miles per gallon. Which of the following would represent a 90% confidence interval for the average highway mileage of all SmartCars? A) 47 ± 1.645(5/√15) B) 47 ± 1.753(5/√15) C) 47 ± 1.761(5/√15) D) 47 ± 1.345(5/√15)
Hoan N.
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