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 deviatio of burning rate; that is o, = 02 = 3 centimeters per second. Two random samples of n = 20 and n2 = 20 specimens are tested; the sample mean burning rates are = 18 centimeters per second and x, = 24 centimeters per second. Use a = 0.10. Construct a 90% confidence interval on the difference in means.

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