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 σ₁ = 0₂ = 3 centimeters per second. Two random samples of m₁ = 20 and n₂ = 20 specimens are tested; the sample mean burning rates are x₁ = 18 centimeters per second and x₂ = 24 centimeters per second. Use a 0.10. Construct a 90% confidence interval on the difference in means. O a. Cl on the mean: -8.45 <= u1-u2 <= -3.55 O b. None among the choices O c. Cl on the mean: -7.57 <= u1-u2 <= -4.43 O d. Cl on the mean: -7.86 <= u1-u2 <= -4.14
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 σ₁ = 0₂ = 3 centimeters per second. Two random samples of m₁ = 20 and n₂ = 20 specimens are tested; the sample mean burning rates are x₁ = 18 centimeters per second and x₂ = 24 centimeters per second. Use a 0.10. Construct a 90% confidence interval on the difference in means. O a. Cl on the mean: -8.45 <= u1-u2 <= -3.55 O b. None among the choices O c. Cl on the mean: -7.57 <= u1-u2 <= -4.43 O d. Cl on the mean: -7.86 <= u1-u2 <= -4.14
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter4: Equations Of Linear Functions
Section4.5: Correlation And Causation
Problem 2AGP
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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 σ₁ = ₂ = 3 centimeters per second. Two random samples of n₁ = 20
and n₂ = 20 specimens are tested; the sample mean burning rates are x₁ = 18 centimeters per
second and x₂ = 24 centimeters per second.
Use a = 0.10. Construct a 90% confidence interval on the difference in means.
O a. Cl on the mean: -8.45 <= u1-u2 <= -3.55
O b. None among the choices
O c. Cl on the mean: -7.57 <= u1-u2 <= -4.43
O d. Cl on the mean: -7.86 <= u1-u2 <= -4.14
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