ACCA F2 Revision part 9c Regression
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wouldn’t coefficient of determination r2= .95*.95=90%
Yes it will!
(If you watch the main lectures for F2 I explain the coefficient of determination – these revision lectures are simply meant as quick revision)
hy,
in question (B) you have given the answer as 0.977 but i am getting it as 95.2
(7*187000)-(2800*420)=133000 (as you stated in the answer
*?[(7*1,400,000)-(2800*2800)]-[(7*26550)-(420*420)]=1396.6 but you wrote 136096
this is leading to a mistake in my calculations,please confirm
thanks
I am actually getting .718. John, I think there is an error in your working in the revision notes. You have (9,800,000-7,840,000) as 196,000, when it should be 1,960,000. Correct me if I’m wrong.
Sir, the question in the revision kit for this chapter..
a) why is the answer : y = 32.84 – 0.0679x and not : y = 32.84 + 0.0679x? for i got a positive answer for b.
Other than that. how do we know how many decimal places should we use in the exams as the b produces the answer of 0.067857142? Same goes to question c) as it results to 0.9554529 (95.5% in percentage) Please help. I’m very confused.
The answer is y = 32.84 + 6.79x
(b is positive)
The answers to all the examples are at the back of the course notes.
The exam will make it clear how many decimal places are required.
Yes, I do know b is positive (because that’s what I got) but I don’t get why the equation of y = a+bx that you wrote in bold is y = 32.84 – 0.0679x.
Where in this lecture have I written that in bold? I cannot see it anywhere!!
In the revision notes.
Now I have found it!
Sorry – it is a typing error, I will have it corrected.
(The same example is used in the full Course Notes and lecture, and there it is typed correctly)
obviously grate but not full lecture in length
its just a revision lecture…the full length lecture is in the “lectures: category
thanks