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The burning rates of two different solid-fuel propellants used in air crew escape systems are being studied. It is known that both propellants have approximately the same standard deviation of burning rate; that is a₁ = ₂ = 3 centimeters per second. Two random samples of n₁ = 20 and n₂ = 20 specimens are tested; the sample mean burning rates are ₁ = 18 centimeters per second and ₂ = 24 centimeters per second. Use a = 0.10. Construct a 90% confidence interval on the difference in means. a. Cl on the mean: -7.86 <= u1-u2 <= -4.14 b. Cl on the mean: -8.45 <= u1-u2 <= -3.55 c. Cl on the mean: -7.57 <= u1-u2 <= -4.43 d. None among the choices

The burning rates of two different solid-fuel propellants used in air crew escape systems are being studied. It is known that both propellants have approximately the same standard deviation of burning rate; that is a₁ = ₂ = 3 centimeters per second. Two random samples of n₁ = 20 and n₂ = 20 specimens are tested; the sample mean burning rates are ₁ = 18 centimeters per second and ₂ = 24 centimeters per second. Use a = 0.10. Construct a 90% confidence interval on the difference in means. a. Cl on the mean: -7.86 <= u1-u2 <= -4.14 b. Cl on the mean: -8.45 <= u1-u2 <= -3.55 c. Cl on the mean: -7.57 <= u1-u2 <= -4.43 d. None among the choices

MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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The burning rates of two different solid-fuel propellants used in air crew escape systems are being studied. It is known that both propellants have approximately the same standard deviation of burning rate; that is a₁ = ₂ = 3 centimeters per second. Two random samples of n₁ = 20 and n₂ = 20 specimens are tested; the sample mean burning rates are ₁ = 18 centimeters per second and ₂ = 24 centimeters per second. Use a = 0.10. Construct a 90% confidence interval on the difference in means. a. Cl on the mean: -7.86 <= u1-u2 <= -4.14 b. Cl on the mean: -8.45 <= u1-u2 <= -3.55 O c. Cl on the mean: -7.57 <= u1-u2 <= -4.43 O d. None among the choices
Transcribed Image Text:The burning rates of two different solid-fuel propellants used in air crew escape systems are being studied. It is known that both propellants have approximately the same standard deviation of burning rate; that is a₁ = ₂ = 3 centimeters per second. Two random samples of n₁ = 20 and n₂ = 20 specimens are tested; the sample mean burning rates are ₁ = 18 centimeters per second and ₂ = 24 centimeters per second. Use a = 0.10. Construct a 90% confidence interval on the difference in means. a. Cl on the mean: -7.86 <= u1-u2 <= -4.14 b. Cl on the mean: -8.45 <= u1-u2 <= -3.55 O c. Cl on the mean: -7.57 <= u1-u2 <= -4.43 O d. None among the choices
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