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 sigma 1 = sigma 2 = 3 centimeters per second. two random samples of n 1 = 20 and n 2 = 20 specimens are tested, the sample mean burning rates are x 1 = 18centimeters per second and x 2 = 24 centimeters per second.
a) test hypothesis that both propellants have the same mean burning rate. use alpha = 0.05. what is the p - value ? .
b) construct a 95% confidence interval on the difference in means mu 1 - mu 2. what is the practical meaning of this interval?
c) what is the beta-error of the test in part (a) if the true difference in mean burning rate is 2.5 centimeters per second?

0.038

step-by-step explanation:

unless you made a typo, the answers are both a and c.

step-by-step explanation:

1.5/3 is .5 whereas 3/9 is .3333333 not proportional

22/33 is .66666 and 4/6 is also .66666 proportional

2/4 is .5 whereas 142/213 is .66666 not proportional

14/7 is 2 and 7/3.5 is also 2 proportional

you could've also checked it by doing this simple division:

if the larger fraction divides with the smaller fraction to equal 1, it is proportional. so let me show you what i mean:

when i divide 22/33 by 4/6 i get 1, so we know it is proportional, and it is the same with 14/7 and 7/3.5. now if i divide 3/9 by 1.5/3 i get .66666 so therefore we know it is not proportional.

there are many ways to do this so i wanted to show you some possible ways.

answer: $13,622.84

step-by-step explanation: check the picture for info and stats : )