Quantitative Methods I (QM1)

at Maastricht University

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++++++ Ask your QM I questions and an experienced Success Formula tutor will answer them as soon as possible ++++++ Any problems or questions while studying/preparing for QM I? Don't worry, we've got you covered! Just post any of your questions in the QM I course on Studydrive (as a separate post, not as a comment) and our professional tutors will help you!!! We wish you lots of success! Your Success Formula Team
how do you do question 20 from the sample paper? thanks
Hi guys, Can you please post this as a separate question, not as a comment :) then it is easier for us to answer the questions and for you to see the answers too! Thanks for understanding !
Were there any mistakes in the resit??? I need ONE point to pass 🙏🏼🙏🏼
same haha
did you hear anything ?
I just don't get it, I get an outcome of 5??
For question 3, you can expand the entire equation to: 3((x^2)+2x+1) - 2x - 2 + 15 - (3x^2) + 2x - 15 = (3x^2) + 6x + 3 - 2x - 2 + 15 - (3x^2) + 2x - 15 The two (3x^2) cancel each other out The two 2x cancel each other The two 15s cancel each other And then you are left with 6x + 3 -2 = 6x +1
Can someone explain this?
Hi there :) in order to solve that question you have to make use of the price elasticity of demand (it is described in your Math reader under section on average elasticity). The formula is the following: (dq/q) / (dp/p) —> where d stands for delta, i.e. the change. In the question you are given that this price elasticity is equal to -0.2 and they want you to find out the price elasticity, which is dp in the formula. So you want to solve for dp in that formula. —> so price elasticity = (dq/q) /(dp/p) = -0.2 —> in the question your are also given the change in q (dq), which is the decrease per barrel from 31.3 to 30.5. So dq = - 0.8 —> further you have the current price (p) = 52.5 —> q, the quantity, is your total current supply, the 31.3 (OPEC) + 68.7 (other suppliers) = 100 Plugging this in the formula gives: (-0.8)/100/(dp/52.5) = -0.2 Now you have to solve this equation for dp --> dividing two fractions is the same as multiplying the reciprocal <=> (-0.8/100)*(52.5/dp) = -0.2 | / (-08/100) <=> 52.5/dp = 25 | * dp <=> 52.5 = 25dp | :25 <=> 2.1 = dp This implies that if they cut the supply from 31.3 to 30.5, the price will rise by 2.1 - so Answer D) We hope this helps! Your Success Formula Team - Lena
Hey guys, that part there is wrong. The second partial derivative of xx is multiplied with the second partial derivative yy, not subtracted. Sorry!
Hi Marta!
Could someone explain how to calculate how many inflection points a certain function has? I also have problems with calculating how many stationary points there are. Thankyou!
Guys does someone have the answers key for QM1 resit in januari 2017? it would be very useful for me.. thanks !
could someone explain this ?
-- QM1 resit tutoring -- Hello everybody, If you are facing the QM1 resit and you would like some extra help in explaining concepts/reviewing past exams etc. then contact me! I can offer online tutoring, so even if you are not in Maastricht over the holidays that’s no problem. I have four years of experience tutoring QM1 and QM2 and tutored for the university and as well as privately for both courses, so I know exactly what you have to watch out for. :) My university tutorial groups in QM2 had a 79% passing rate, so if you want to make sure to pass this time around shoot me a message! I can tutor in German, English and Spanish. Right now I am still quite flexible regarding times for tutoring spots until the exam, so be sure to save your spot now before they run out. :) You can contact me on WhatsApp (+491789149648) or Facebook (Lynn Se).
Does someone know why the Math exam is out of 22 and not out of 20 ?
Because they gave everyone two bonus points for the math part.
Does anyone have the answers to the course assignment of QM1? Would be most grateful. Am willing to pay.
How can I calculate my end score for the QM1 exam?
check on the portal in my grades how many bonus points you got and add them to your score
Hey everyone, can someone tell me the email address that we can complain to about the exam? I cannot find it somehow 😁
its not an email adress its a link on the student portal called "exam comments"
Also can someone tell me why answer D is wrong? For question 40. Thanks
it is not wrong they published that two answers are right for question 40 (see answerkey)
-- QM1 resit tutoring -- Hello everybody, If you are facing the QM1 resit and you would like some extra help in explaining concepts/reviewing exams etc. then contact me! I really recommend to already start revising now, otherwise you'll be very stressed in resit period. I have four years of experience tutoring QM1 and QM2 and tutored for the university and as well as privately for both courses, so I know exactly what you have to watch out for. :) My university tutorial groups in QM2 had a 79% passing rate, so if you want to make sure to pass this time around shoot me a message! I can offer online tutoring, so even if you are living outside of Maastricht most of the time it's not a problem. I can tutor in German, English and Spanish. Right now I am still quite flexible regarding times for tutoring spots so be sure to save your spot now before they run out. :) You can contact me on Facebook (Lynn Se) or whatsapp (00491789149648).
How did you find the exam guys?
Hi, Does anyone know how to calculate Q20) from the trial exam? Thanks X
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Hey, I also don't get how to go from the second to last step to the last step. Anyone can explain?
It's a bit confusing, but basically you have to rewrite it and see that 0.65 delta x / 5 = 0.13 delta x, same for the y; 0.29 delta y / 3 = 0.097 delta y
Last minute help needed!! When I calculate the standard deviation, do I really subtract the mean from every value?? Thank you!!
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You are welcome - success for the exam today! :)
Thanks a lot!! Is there no faster way to get to the standard deviation? :)
Trial Exam Math 9) Could anyone explain to me how to derive this function to check on the extreme points? Thanks
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A collegue of yours gave a different answer B... could you let me know what is the right answer?
B is the right answer
can someone help me with question 30? I don't know where to start and what to do...
Hi David, Please find attached my notes. In Q 30, they are looking for the conditional probability. Hope that helps! Best, Your Success Formula Team - Lena
Yeah perfect thanks :) took a few detours to understand that you need to combine conditional probability with z scores 🙂
No area was marked for this question
Wat does the sign mean that looks like aan E? (Domain x E R)
It just means that x must be a real number. That's how we used to write it in my high school
It means “element of” so if you write x e(the weird one) R - it means element of all real numbers, as Angie also mentioned :)
how do you get to P ?
You have to set the derivative equals to the slope of the tangent line. The slope is -1 (p-x). So you find x=1. Tangent line is y-1 = -1(x-1), so p = 2 (y = -x + 2)
It's not "different" instead of equal ?
yes you're right !
No area was marked for this question
Is mastery just 100% if you have 1/1 or should you look at the percentages in Sowiso and MSL? I know that in general I had around 94% everytime, however at my scores it does say 1/1. Should I fill in 94 or a 100?
How do you get to the final result? I get to x = y^2 / y^2 -1
Hi Anonymous Dice, What you got is correct and then they rearrange it further — I have done the calculation for you. Don’t ask me why they rearrange it - i don’t know, it is unnecessary for me 🤷🏼‍♀️🤦🏽‍♀️ Best, Your Success Formula Team - Lena
How did you get to this answer? Thank you ! Good luck for the preparation.
ME = Z * SE 0.05 = 1.96 * square root of [(0.5 * 0.5)/n] n = 385 The z depends on 95% confidence level, and you look it up in the table. SE = square root of [(p*q)/n]. You take 0.5 * 0.5 because they did not mention any p or q and then you use 0.5, always. Hope this helps!
Hey guys, do you know if we need the mastery or only the progress in sowiso to get the bonus points?
you need to do all the stats stuff online and all the math stuff on sowiso to get half of the bonus points you missed out on during the quizzes
Exactly, but some students told me that we only need the progress in sowiso and not the mastery. For Mystablab it's clear for me. We need the mastery
how do you find the extreme points of the function (x-1)^2(x+2)^2?
Hi Marloes, Thank you for posting your question here again. :) I have calculated it - I hope that helps you. If this would come up on an exam though, i would probably do it differently: I would still calculate the derivative, but then I would plug in the answer possibility to see which one yields I f’(x)=0 - that would be easier than doing what I did, especially if you don’t know factorization. Hope that helps. Your Success Formula Team - Lena
How did you find y=1?
how do you know this?
Hi Anonymous Pistol, In order to answer this question you actually do not have to compute anything - it follows from the definition of a confidence interval. The 95% interval implies that you are 95% confident that the true proportion lies within the boundaries of your interval, so in this case that it is between 0.6 and 0.7. Also in general, a 95 % confidence interval corresponds to a two-tailed hypothesis test with an alpha level of 5% ( 100 - 95%) . The hypothesized proportion is 0.63, which is right within that confidence interval. This would mean that you would fail to reject that hypothesis at the 5% alpha level, hence the corresponding p-value (which is the probability of observing such a test statistic or an even more extreme one, if the null hypothesis were true) needs to be larger than 5%. So just as a general take-away: if the hypothesized value is within the boundaries of the interval, the corresponding p-value will be larger than (100- stated confidence level). If it is not within the confidence interval, then the p-value will be smaller than 100% - CL. Hope that helps! We wish you success! Your Success Formula Team - Lena
Can someone explain how this equals - ln of f(x)? Aren't you supposed to use quotient rule here?
Hi Anonymous Bang, I have attached my calculation. By using some of the logarithm and simplification rules, you can rearrange the function, which will make the derivative easier - because then you do not need the quotient rule anymore. I hope that helps! Your Success Formula Team - Lena
Anyone has a explanation and calculation?
How do you know this?
Because then we're only left with function ln(x) which happens to have no extreme points
Hi Anonymous Noodle Soup, Floris explanation is correct, but in case you cannot see that immediately, you can also calculate it! I have attached my calculation and notes, hope that can clarify it further! Your Success Formula Team - Lena
why is it D?
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Why is it A?
A convex function is shaped like this: \_/ as you see it has one minimum point and no inflection point (as concavity doesn't change)
can someone explain?
Hi Anonymous Trump, Please find attached my notes :) What is important here is to remember is that with a tangent line, both the function and the tangent line will have the same slope. With this property, I was able to solve the question. Does that help? Let me know if you have more questions! Your Success Formula Team- Lena
why bigger or equal to 1? isn't the ln rule that it should be bigger than 0?
Hey Anonymous Dice, Please find attached my calculation with all steps. You are right that it is bigger than 0, but by rearranging you will see where the one comes from. Your Success Formula Team- Lena
how do you know this formula? explanation?
Hey, for exercise 17 ) at a'x( x,y) = -2...... how does the -2 becomes +2( x^2 -y^2) in the further step ??
I equated that equation to zero and then brought the 2 to the other side (turning it positive)
Could somebody explain whats happening here? Does it have something to do with the chain rule...?
In fact , you just have to analyse the second term from n'' ( The first one is always positive ) so the change of concavity can just come from e^-(t-3.31)-1 -> So you find that it's = 0 When t = 3.31 ! If you replace t by 2 for example , you 'll find that n''>0 And if you replace it by 4, you find that n''< 0 => At first it's convex and then concave
also that's just me simplifying the n''(t) function
can someone explain this?
the answer for 8 is A (not D). The negative in front of the f and then in front of the x flips it horizontally and vertically.
how?
the local minimum, and local maximum. There is no inflection point as it's decreasing so there's only 2.
How?