Advises

Hi, I have checked your solutions, they are very clear and precise! I would like to give you some advises. 1.

The interval for error term, strictly speaking, is an open interval. (But I know that it is not a big problem and even we are used to write it as closed interval.)

2.

For question 3(b), it is better to calculate t = ln

is 3.

5 2

13 3

first before discussing y > 0 for all t.

Since, theoretically, once x = 0 , the differential equation of y will be changed. Of course the above is not a must, as we can see that even x = 0, no one can kill y so that y a constant forever. From my understanding of the question, I think that the writer request us to compare their rejecting rules and see whether they are different. So, my solution is, based on n = 16: * Councillor’s rule in rejecting null hypothesis: X > 820 (given) *

The one of assistant: X > 800 + 1.96

50 16

[or

X < 800 − 1.96

X > 824.5

So they are different. I am not sure whether I am correct or not, pls contact me if I made any mistake. Are you a current AL student?

人中呂布馬中赤兔

50 16

]