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Q1) Burning rates of 2 different solid-fuel propellants utilized in aircrew escape systems are being studied. It is known that both propellants have about same standard deviation of burning rate, that is σ1=σ2=3 centimeters per second. 2 random samples of n1=20 and n2=20 specimens are tested, sample mean burning rates are x bar 1=18 centimeters per second and x-bar2=24 centimeters per second.

a) Test hypothesis that both propellants have same mean burning rate. Utilize α=0.05. Compute the P value.

b) Create a 95% confidence interval on difference in means μ1-μ2. Determine the practical meaning of this interval.

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