Unformatted text preview: .217 .021 2.262 10 ± = -.1342 to .1762 b) What does the interval suggest about mileage differences for the two fuel types? They may be equal since 0 is in the interval. Since the interval is partly negative, it is also possible that the mileage with the discount gas is better. 3. TWO-SAMPLE t . Let μ 1 = Nitrites, μ 2 = Control, Hypotheses: H o : μ 1 = μ 2 H a : μ 1 < μ 2 Sample sizes are large enough that normality is not an issue. We also expect that the samples are chosen randomly. ( 29 2 2 7880 8112 1115 1250 30 30 t-= + = -.759 and p = .226 Conclusion: Since the p-value is not very low, we fail to reject the null hypothesis. It does not appear that nitrites can significantly reduce the amount of bacteria in meat....
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- Spring '11
- Normal Distribution, Null hypothesis, #, Statistical hypothesis testing