The burning rates of two different solid-fuel propellants used in aircrew escape systems are being studied. It is known that both propellants have approximately the same standard deviation of burning rate; that is 01 = 02 = 2 centimeters per second. Two random samples of 1 21 and 221 specimens are tested; the sample mean burning rates are X1 = 18 centimeters per second and X2 = 25 centimeters per second. = (a) Test the hypothesis that both propellants have the same mean burning rate. Use α = 0.05 (b) Construct a 95% confidence interval on the difference in means #1-#2. . What is the P -value?