Only solve exercise C)In the other image, this is the correct answer, (just to check) c) 95% level of confidence, E = 1, and zes =1.96국(o.어) 0.5+1.2) =10.37,Use n, - na - 11 10-7. + Two different formulations of an oxygenated motorfuel are being tested to study their road octane numbers. Thevariance of road octane number for formulation 1 is of = 1.5,and for formulation, 2 it is o = 1.2. Two random samples of sizen = 15 and n = 20 are tested, and the mean road octane num-bers observed are x¡ = 89.6 and x = 92.5. Assume normality.(a) If formulation 2 produces a higher road octane numberthan formulation 1, the manufacturer would like to detectit. Formulate and test an appropriate hypothesis usinga = 0.05. What is the P-value?(b) Explain how the question in part (a) could be answeredwith a 95% confidence interval on the difference in meanroad octane number.(c) What sample size would be required in each popula-tion if you wanted to be 95% confident that the error inestimating the difference in mean road octane number isless than 1?

The variance for population 1 is 1.5, and variance for population 2 is 1.2. The margin of error is…

Answered: (c) What sample size would be required…

(c) What sample size would be required in each popula- tion if you wanted to be 95% confident that the error in estimating the difference in mean road octane number is less than 1?

Calculus For The Life Sciences

2nd Edition

ISBN:9780321964038

Author:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.

Publisher:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.

Chapter1: Functions

Section1.2: The Least Square Line

Problem 1E

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Unfortunately, arsenic occurs naturally in some ground water. A mean arsenic level of u = 8 parts per billion (ppb) is considered safe for agricultural use. A well in Los Banos is used to water cotton crops. This well is tested on a regular basis for arsenic. A random sample of 37 tests gave a sample mean of = 7.3ppb arsenic. It is known that o = 1.9 ppb for this type of data. Does this information indicate that the mean level of arsenic in this well is less than 8 ppb? Use the classical approach. Use a = 0.01 What is the Decision (step 5) for this problem? There is not sufficient evidence at the 0.01 level of significance to show the mean arsenic level in the Los Banos well is less than 7.3 ppb. O There is sufficient evidence at the 0.01 level of significance to show the mean arsenic level in the Los Banos well is less than 8.0 ppb. There is not sufficient evidence at the 0.01 level of significance to show the mean arsenic level in the Los Banos well is less than 8.0 ppb. O There is…
Two different formulas of an oxygenated motor fuel are being tested to study their road octane numbers. The variance of road octane number for formula 1 is o? = 1.5, and for formula 2 it is o, the mean octane numbers observed are = 89.5 fluid ounces and I2 = 93.1 fluid ounces. Assume normality. = 1.2. Two random samples of size n1 = 15and n2 = 20 are tested, and (a) Test the hypotheses Ho : H1 H2 versus H1 : µ1 < µ2 using a = 0.05. Round your answer to three decimal places (e.g. 98.765). %| Zo v Ho. (b) Calculate a 95% two-sided confidence interval on the mean difference road octane number, x1 – X2. Round your answer to three decimal places (e.g. 98.765).
Unfortunately, arsenic occurs naturally in some ground water. A mean arsenic level of µ = 8 parts per billion (ppb) is considered safe for agricultural use. A well in Los Banos is used to water cotton crops. This well is tested on a regular basis for arsenic. A random sample of 37 tests gave a sample mean of = 7.3ppb arsenic. It is known that o = 1.9ppb for this type of data. Does this information indicate that the mean level of arsenic in this well is less than 8 ppb? Use the classical approach. Use a = 0.01 What is the calculation (step 4) for this problem? Z = -2.34 z = 2.34 z = 2.24 z = -2.24
Unfortunately, arsenic occurs naturally in some ground water. A mean arsenic level of μ=8 parts per billion (ppb) is considered safe for agricultural use. A well in Los Banos is used to water cotton crops. This well is tested on a regular basis for arsenic. A random sample of 37 tests gave a sample mean of x=7.3 ppb arsenic. It is known that σ=1.9 ppb for this type of data. Does this information indicate that the mean level of arsenic in this well is less than 8 ppb? Use the classical approach. Use α=0.01 What is the hypotheses for this problem? A: Ho μ =7.3ppb vs HA μ < 7.3ppb B: Ho μ <7.3ppb vs HA μ ≥ 7.3ppb C: Ho μ =8.0ppb vs HA μ < 8.0ppb D: Ho μ <8.0ppb vs HA μ ≥ 8.0ppb
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The critical value for the Pearson's correlation coefficient for two variables collected from 15 people (alpha = 05) would be?
The burning rates of two types of propellants used in aircrew escape systems are being studied. It is known that the two types of propellants have different SD of burning rates. Two samples of n₁ :20 and n₂ 35 specimens are tested, and sample mean burning rates are ₁ 19.05 cm/s and ₂ = 25.37 cm/s, sample SD's are $₁ = 3.81 cm/s and s2 = 3.97 cm/s. Test the hypothesis that these two types of propellants have the same mean burning rate at level a = 0.05. =
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