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MTH 220 May 22 Open Questions
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Kasey
7:37
I've started the Chlorine case as well and I'm already thrown off because it gave us a standard deviation in the question.
AvatarGreg Miller
7:24
I got a huge red "NO" written in like 84-point font all across a a few Homework assignments a few times over this...
Ben
7:23
Hah, I bet that was the highlight of his day whenever he could smoke someone over that
AvatarGreg Miller
7:17
I had a professor in grad school that would HAMMER us over CI phrasing.. he took the severe approach of embarassing us all until we wrote it right... oh.. memories of pain..
sad 1
7:16
Excellent.. it can tricky.. but once you practice the wording a time or two.. it comes together
Ben
7:15
Your statement does make more sense about the confidence interval and what it's trying to relay. I read over it in the case study manual a few times but you definitely clarified it here. Thanks!
AvatarGreg Miller
7:10
Most CI sentences that stray away from the description that I have given here wind up accidently stating something that isn't true.. and unfortuantely.. that's the case with your suggested sentence.  It's quite subtle.. but important.. but we've heard that before in this class.
7:09
Whether "WE" are one of the 90% that did.. is well.. unknown.
The actual MEANING of this phrase is.. if we had 100 samples of the same size... just like ours.. then we can be confident that 90% of those samples would create CI that capture the true pH and 10% won't
7:08
The sentence ought to be more benign that that.. "We are 90% confident that the true pH level in the pool is between x and y"...
It isn't true.
The sentence about the CI needs to be changed...
7:06
Ben.. honestly.. I think this is one (maybe rare) case where the population can be described in very, few words... the population is "the water in the pool"... or even more succinct.. "the pool"
7:04
Kasey.. studentizing is the term used when "s" is in the formula (when creating a t statistic)... standardizing is the term in other scenarios.. honestly... very little difference in the terminology and sometimes "in class" i don't mention it at all.
cool 1
7:03
Ben...let me go check the phrasing of the problem.. hold on..
Kasey
7:02
Hi Dr. Miller. Are studentizing and standardizing the same thing?
Ben
7:02
Dr. Miller, I'm working on the chlorine case and have a couple questions. One, is the population all the water in this pool or all pH tests of this pool. Second, you say that a one sentence explanation will do for the confidence interval. For this I said, "This CI states that 90% of all pH test averages will be between [Lower bound,Upper bound]." Is this sentence valid?
AvatarGreg Miller
7:02
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