2. A 95% confidence interval for ?? − ?? is (-4.5, -0.15). Basedupon the data from which the confidence interval was constructed,someone wants to test H0: ?? = ?? versus HA: ?? ≠?? at the ? = 5%significance level.
(a) Based upon the confidence interval, what is your conclusionof the hypothesis test? Explain.
(b) Can we use the above confidence interval without anyadditional information to conduct the hypothesis test at the ? =10% level? Why or why not?
