(Solved): The burning rates of two different solid-fuel propellants used in aircrew escape systems are being ...

The burning rates of two different solid-fuel propellants used in aircrew escape systems are being studied. It is known that both propellants have the same standard deviation of burning rate; $\sigma 1=\sigma 2=3$ centimetres per second. Two random samples of $n1=n2=20$ are tested; the sample mean burning rates are 18 and 24 centimetres per second respectively. Construct a $95\%$ upper bound on the difference in means $\mu 1-\mu 2$. Please report your answer in 2 decimal places. $-4.14$ $0/6$ points A paper reported a (1- $\alpha$ ) confidence interval for the proportion of voters is $(0.561,0.599)$ based on a sample of 2,089 people. However, the paper omitted the value of $\alpha$. What is the value of $\alpha$ ? Please report your answer upto 3 decimal places.