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C. (iv)
D. (iii)
E. (ii)
The burning rates of two different solid-fuel propellants used in
aircrew escape systems are being studied. Assume that both
populations are normally distributed, with standard deviation σ = 3.5
centimeters per second and σ =4.2 centimeters per second for
propellant 1 and propellant 2, respectively. Two random samples of
n₁ = 25 and m =18 specimens are tested, the sample mean burning
rates are x = 28.1 centimeters per second and x2 = 27.5 centimeters per
second. A researcher would like to test the hypothesis that both
propellants have the same mean burning rate, at the 5% significance
level. State the null and alternative hypotheses and find the value of
the test statistic =0.
(i) H₁ = 0, H₁: 1 - 1 = 0, = = 0.982
:
(ii) H₁ μ-μ₂ = 0, H₁ µ µ₂ =0, =₁ = 0.474
- #0, H₁: 14-14₂ = 0, =0 = 0.474
(iii) H₁
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