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F2 Revision Lectures
November 28, 2015 at 4:00 pm
wouldn’t coefficient of determination r2= .95*.95=90%
John Moffat says
November 28, 2015 at 6:04 pm
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)
April 23, 2015 at 6:00 pm
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
May 11, 2015 at 10:58 pm
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.
July 22, 2014 at 4:51 am
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.
July 22, 2014 at 7:21 am
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.
July 22, 2014 at 7:44 am
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.
July 22, 2014 at 8:13 am
Where in this lecture have I written that in bold? I cannot see it anywhere!!
July 22, 2014 at 9:01 am
In the revision notes.
July 22, 2014 at 9:37 am
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)
November 25, 2012 at 1:45 pm
obviously grate but not full lecture in length
May 6, 2014 at 12:05 am
its just a revision lecture…the full length lecture is in the “lectures: category
May 15, 2012 at 3:32 pm
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