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  2. Sir you said in regression analysis we need to find equation of line similar to this form “Y=a+bx” but the equation you found actually contains a minus sign in it….. Why is that so?????

  3. Dear Sir,

    I am planning to sit in December/16 exams for F2 and F3, I am preparing myself for the exam by taking your online lectures, I also downloaded notes for BPP. When I compare your lectures and notes to BPP there are many concepts missing,(when comparing your content with BPP) may be BPP study material which I downloaded is not up to date or exam specific, but I failed to attempt few question from BPP practice bank. I need to know whether your notes and lectures are sufficient or should I have to go through BPP study material also?
    will really appreciate your kind response, just like the efforts you have put in.

    Best Regards,

    • Our lectures are what we teach on normal ‘face-to-face’ lectures, and although we do not claim our lecture notes to be a Study Text (otherwise they would as en enormous as the Study Text 馃檪 ), our lectures and notes are more than enough to be able to pass the exam well.

      The book you should be using is the Revision Kit because that contains many exam standard questions to practice on, and it is practice at exam-standard questions that is vital.

      You will certainly not find many questions in the Revision Kit (or in the real exam) that you should not be able to attempt after watching our lectures. If you do have any problems/questions then as always ask in the Ask the Tutor Forum and I will help you.

  4. Hi John,

    I have a Sharp EL-738F calculator which has a statistics mode that simplifies the linear regression calculations immensely. Once I’ve entered in the data pairs, it’s 3 keys to get the answers for a, b and r.

    Is this permissible? Is there any other reason I would need to perform workings as you have shown in the lecture?

    • It is permissible provided that your calculator does not display any text – it must only be able to display numbers.

      Make sure that you understand what is happening though. The questions are deliberately designed to check your understanding – not just your arithmetic.

  5. 19:49 Sir, I cannot understand why we have 67,86 instead of 678,6. We calculated number of units in hundreds, so shouldn’t we multiply 6,786 by 100? There is no doubt that 6,786*100=678,6. Could you tell me why I am wrong? 馃檪

  6. Good day Dear John,

    In simpple words can we say that….

    After all calculation we assume that fixed cost remain the same and varibale cost increase in linear relation to quantity of produced items.

    And the only problem can be that

    In real life,for exmaple electricity supplier can increase varibale cost per unit after some Kilowats consumed.But our current calculation does take into accounts this factor.

    Kindly asking for your advice

    Thanks,
    Fedor

    • Costs can be fixed or variable or semi-variable (part fixed and part variable).

      The cost per unit certainly can change over different ranges of units, and so can the fixed cost (which is then a stepped cost).

      We can deal with all of them (and could well be asked to in the exam – but not as part of a question on regression analysis).

      This is all explained in the lecture that goes with Chapter 4 of our lecture notes. (The lectures are supposed to be watched in number order 馃檪 )

  9. hello! i am sorry about my silly question but i noticed that:
    we write: a=60 – (6.78*28)/7 = 60-27.12= 32.88
    but as we can see 60 is actually 60.000 and 28 is actually 2.800. (and not 28000 as we took it above)
    so it gives us a=60000 – (6.78*2800)/7= 60000- 2712=57.288
    or maybe not?

    • I really do not know why you have posted this in the Paper F2 forum.

      If you have read the lecture notes for Paper F5, you will have seen in the first paragraph of the relevant chapter that you cannot be asked calculations on regression analysis in Paper F5. For that reason you are not given the formulae – you cannot be expected to use them!

  12. Sir if you don’t mind can i get some quizs that something look like ex2?

    because i read new formula from management accounting book sales in korea

    so i want to proof it new formula is work

    • Sorry, but I really do not know what you mean. If you have a book then surely the book will explain?
      Otherwise you should watch the lecture again.
      If the answers in your book do not make sense, then ask in the Ask the Tutor Forum for Paper F2,
      (and I do assume that you have tried our practice test for Paper F2?)

      • Sorry my Eng skill is really horrible x(

        I have found other formula to slove the example2 and I am wondering whether the formula works or not so if you don’t mind can I get some quizzes like that?

    • Wrong!

      For F5 this is assumed knowledge from Paper F2.

      If you are studying F5 then I assume you will have been watching our lectures without free lecture notes in front of you (otherwise there is no point in watching the lectures). In that case you will have read the introductory paragraph in chapter 12 – especially the part in bold letters!

      In future please do not ask about Paper F5 as a comment to a Paper F2 lecture.

  15. Dear John,

    I have the same doubt as Sashen and the same seems to have been missed by you. 100s would mean we had to move 2 decimal places which you moved just 1. is there a specific reason or it was missed inadvertently.

    Thanks
    Amit

      • Yes Sir, i agree with you because some of us students are not too mathematical.
        The costs gives us exactly 32857.2 when multiplied by 1000. Approximately we have 32,857 in ‘000’ while 6.7857 when multiplied by 1000 by gives 6785.7 approximately to 2 d.p we got 67.87 ’00’. I must confess, i was initially confused.
        Thank you so much for your explicit and simple way of lecturing global students.
        We appreciate you.

  17. Hi

    Should the cost in 1000s on the 4th line in fact read 85 as opposed to 80? I am using the lecture notes from F5 but the above lecture from F2

    Also, the answer in the back of the lecture notes show the answer as

    y= 31.430 + 73.21x

    Should this in fact read y=31,430 + 73.21x ? as per your answer in the lecture? (allowing for the variance in numbers due to the different value of the 4th line?

    many thanks

    • The fourth line in the answer does read 85 and so your first question is puzzling me.

      As regards the 31.430 – yes, indeed it should read 31,430 (and comparison with the high low equation confirms that). It is just a typing error.

      Incidentally, if you are studying for Paper F5 then I do hope you read the first paragraph of the chapter. Calculations on regression analysis can no longer be asked – you can only be expected to be aware of the idea. It is only in F2 that calculations can be asked.

      • I was referring to your answer in the lecture…your 4th line reads as 80 in the lecture.

        Yes, I am aware of that…I was going through the example to gain a broad understanding of regression

        Many thanks for the quick reply…much appreciated

  19. Hi Sir

    I would like to know in the final Equation:
    y = 32857 + 67.86x

    I understand that 32.857 the decimal moved to the right because there was 3 zeros in the cost figure.

    I would like to know why did 6.7857 only moved one decimal place ?

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