View Full Version : course4 actex corrections
09-09-2001, 11:10 AM
On practice exam 1 Q9, I want to confirm that the last sentance should have read "find the resulting change in the smoothed value of z^10." instead of z^11.
09-10-2001, 07:59 AM
Here is another bad question on practice exam 1. on question 13, I believe they should be looking for the estimated varience of the probability P[1<X<=4]. This way, there is only one correction for the solution on page 18 in the first line of the solution. replace every 2 with a 4. after that the solution is correct.
New at pd
09-12-2001, 12:24 PM
Yeah, it should be z^_10.
The "ordinary" moving 3 period average is defined as (1/3)*(y_t + y_(t-1) + y_(t-2))
Since in this problem they are defining the moving average according to the z's, which are only indexed up to 10, you are correct in saying that it is a mistake.
09-12-2001, 01:00 PM
to JRL. Thanks for the confirmation. I will try to look for more problems as I go along. Currently I am stuck in a quagmire of credibility.
<font size=-1>[ This Message was edited by: Needo on 2001-09-12 13:01 ]</font>
New at pd
09-12-2001, 01:17 PM
Credibility scared the hell out of me upon first inspection. I now feel pretty confident in it, thanks to ASM.
Let me know if you have a specific question.
07-28-2006, 04:57 PM
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