<p>Fresh, you are wrong. The answer is 24. If you put the info in your calculator and use ExpReg, you get…</p>
<p>y=411.6698268 * (1.142821388^x)</p>
<p>So…</p>
<p>10000=411.6698268 * (1.142821388^x)
x=23.896~=24</p>
<p>does anyone know what number (i.e. 45, 46) the exponential regression question was? I’m almost positive that I messed up my answer sheet because I did the 50th question, filled in what I believed to be the 50th bubble, but when I looked at my answer sheet after the proctor called time I saw that question 50 was left blank. I’m not sure whether or not I want to cancel my score, so I really need to know what number the exponential regression question was, to figure out how many problems I screwed up. Thanks</p>
<p>^#45.
+++++++++</p>
<p>hmm…</p>
<p>you are supposed to regress not progress…based on your logic the amount sold would increase infinitely…the rate at which it incresases should decrease that’s why it’s called a regression…</p>
<p>Bobdylan–Regardless of the calculator, if you do the work by hand, it comes out to 21…But i will assume you are right, because there is no way im going to argue against the results of a calculator…and plus, in the blue book, there is a sample regression problem in which A also comes out to a fraction, kind of like how a=411.xxx. So most likely, you are right.</p>
<p>Blackbeastbomb–You said your answer is 28, but how does that logically make sense?..based on your logic, it seems that the number would also infinitely expand…plus if the rate you got for b is greater than 1, your answer is supposed to infinitely expand…</p>
<p>
Not exactly - the term “regression” was borrowed from biology and changed its meaning in statistics.
Model function can be monotonically increasing, as in this question.</p>
<p>I used the euqation y=Ae^rt for my regression yielding the answer 28.</p>
<p>Doesn’t the term regression refer to the rate of increase…the rate the amount sold is increasing by is slowly decreasing…correct?</p>
<p>I assumed that regression referred to taking the input and output of a function and regressing (“going backward”) to find the function itself.</p>
<p>I don’t like that they only gave us two values. There are a million equations that work with only two data points.</p>
<p>there were three I think…5/850, 12/1250, 0/400 are the ones I used…</p>
<p>@blackbeastbomb - just like a model function, the rate of increase could be constant (linear regression), decreasing or increasing. If you took Calculus - think derivative.
In any case, the rate of increase is not really relevant here.</p>
<p>It was 10/1520.</p>
<p>“initially sold 400” yes, three points.</p>
<p>For y=Ae^(bx) you can check your answer here:
[Regression</a> Tools - Online Exponential Regression](<a href=“http://www.xuru.org/rt/ExpR.asp]Regression”>http://www.xuru.org/rt/ExpR.asp).
y=10,000 when x=24.441.</p>
<p>but did everyone have the EXACT same test in the exact same ORDER?
I know all of the questions must be the same but are the questions and letter choices in the same order for each test?</p>
<p>^Does it really matter? </p>
<p>Generallyrong–how did you think you did?</p>
<p>Probably 800.</p>
<p>What would you predict the score to be if I omitted 10 and am pretty confident about the other answers I put down?</p>
<p>Wlell, the curve is likely to be a 43 or a 44. If it’s a 43, then its a raw score of a 38 which is around a 750 but if the curve is 44 (God Forbid) , then your score is around a 740…so prolly 750/740</p>