Quantitative Methods II (for IB / QM2)

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@Olivia van Aalst: You can in general always take the degrees of freedom that are closest, this should not change your answer on the exam. The reason why they sometimes round down is to be a bit more conservative. If you take a value with lower degrees of freedom, the critical value in the table will be higher --> this implies that it will be harder for me to reject. Hence, I am less likely to do a Type I error - this is what is meant with being more conservative. I hope that helps. We wish you success! Your Success Formula Team - Lena
Thank you! That clarified it!
Dis shit wrong! correct it lmao
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its not wrong lol ciao
you‘ll se bruv
I think you mean house 4 instead of 3
Its house 5 not 4
how do you calculate these numbers?
Zprice*Zfloor first get each Zx (Zx = x - mean x / Sx) and Zy (Zy= y - mean y / Sy) Then multiply Zx with Zy. For example Zx = (240-236.917/57.236)=0.0538 Zy= (138-112.5/48.352)=0.527 Zx*Zy = 0.0538*0.527= 0.0284
exactly :)
Isnt this because we are checking for a correlation that the explanatory variable explains the response variable. (so we are looking at the higher the price, the more area, and not the other way round)
Hey :) That is true, but also the relationship is the same, so it would just be the same number in the upper right corner so excel is just leaving it out.
isn't it a +for the third determinant? (I thought it was + - + - +.....)
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Oh wait i read that wrong, but yeah that’s true, but the third one would be 0 so I left that out!
Ahhhh yeah my bad, I completely forgot there was a third column, I skipped this one you're right!
Didn't it say to plot z price against z floor? That would mean that they would be in one scatterplot. Maybe I'm mistaken :) someone please help
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I'm confused as to in what order to put the x and y columns in... in the book it says to put the x-variable (floor) and the y-variable (price) next to each other in that order. You put them in the other way around.
Can someone explain me this one please ??
Matrix B gives the inputs(door, window, plank) needed to produce a sauna or garden house. Matrix A gives the minutes per machine needed to produce these inputs(door, window, plank).
How do you calculate these numbers?
by multiplying the both z-scores
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How can you do the z price and z floor? what should i select on excel?
use the formula '=STANDARDIZE(x; mean; standard_dev)' for example Zprice of price 240 (mean of price is 236.9167, stdev of price is 57.23672) --> =STANDARDIZE(240; 236.9167; 57.23672)
isn't it 0 ?
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thank u tocaro!! greetings to frederica ;)
bona sei la salvezza <3
<3 <3 <3
how does this give 8?
It’s the 2 from the 1,2 slot multiplied by the 3,3 slot (4)!
where do these numbers come from?
It’s the 4 from the bottom right multiplied by ((1*-1)-(2*3)) which is from the square that’s not crossed out with the yellow pen :)
great thx mate!
Why did you flip the signs here?
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Oh yeah sorry, I misunderstood 😅 But if you look at the matrix above, you can see that the A was in the matrix with coefficient 1. So what I did was move it to the left of the = sign, which would make it -A. That’s why I just flipped everything, because that’d make it A! :) Hope this helps.
Got it! Thanks fam!
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ily
🥰
Shouldn't this be 1? Because the determinants of A and its transpose are equal (being -1). Multiplying (-1) by (-1) equals 1
Yeah, you’re right, I only realised it after I uploaded the file :/
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Nice document! Great that you added the explanation how to get there :)
I got you fam
Shouldn't it be: -1 0 0 -1 ?
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God created the heavens, the earth and the seas in six days, on the 7th he created you!
🤩
shouldn't it be 0.4Y1 instead of -0.6Y1 (0.6Y1 - 0.2Y1) ? :)
No, because you also have to subtract the Y1 that’s on the left side :)
thanks you!
how did you arrive to this ?
The answer is -128, but apparently the last two digits were cut off :)
Where does that come from?
This should be 8 instead of 6
Yes you're right! Sorry about that :)
actually 7.6 according to tutorial
I couldn't see the 2nd question of 2.2 b). Could you write the answer please. :) TY
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Thank You :)
You’re welcome :)
shouldn´t it be unequal 2, because if it is unequal 0 you can use 2 and than it is unsolvable?
You are right, if p & q are both = 2 then it is inconsistent. If both are unequal 2 there can be more solutions but I am not sure if it gives infinitely many solutions.
whys is it -6? 4+(-2)=2 right?
It’s 4 + 5x(-2) -> 4-10 = -6
it is 8 instead of 6 :)
u mean 0 and 1 right ? :D
Yes!
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You used a 𝛂=0.05 instead of a 𝛂=0.1 as in item f)ii) of the assignment
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Thank you!:)
You’re very welcome!! :)
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in question 11 shouldn´t it be unequal 2 for infinitely solutions?
this step
I added the equations to each other to build a Gaussian 'staircase'. It is explained in the chapter :)
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my life is saved
:D
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I just don't understand 8. does someone?
What exactly do you not understand?
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Hai sbagliato week bro
no fra ho fatto week 3
Grazie al cazzo
Do we always have to draw this?
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alright thanks for the quick answer <3
Always welcome :P
Thank you very much for posting , but I think in task 2 it's not the matrix times architect, engineer, etc, but times Flower and Sun Resort (also if u see at the condition 3x2 multiplied with 2x1). Nevertheless, very helpful!
how do we know we arrived to the reduced form ?
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But isn't the second requirement that every column containing a leading one has zero elsewhere? Isn't it in this case wrong tho?
I think you're right! The correct reduced form is the one below. Sorry for any confusion.
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Can you please, explain what you did?
++++++ Ask your QM2 question here and an experienced Success Formula tutor will answer it as soon as possible ++++++ PLEASE ask your questions as a SEPARATE POST and NOT as a COMMENT here! Any problems or questions while studying/preparing for QM2? Don't worry, we got you covered! Just post any of your questions in the QM2 course on Studydrive and our professional tutors will help you!!! We wish you lots of success! Your Success Formula Team
Why is it not a "-" ?
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Thanks!!
My pleasure
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lovely
Thank you!
you are most certainly welcome, thus it is I, 21 the first
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good work! thank you for the document :)
Thanks :)
Hey, how do you come to this part after figuring out that p= 5+Y? Btw thank you for uploading ;)
Heya, I just noticed I wrote it in quite an illogical order, but I derived it from the system of linear equations I mentioned two steps above! (The q=4-0.2p+0.4Y etc.)
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