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March 21, 2021 at 10:45 am
Great lecture sir, and thanks for the logics behind the equations and the graph support while explaining.
Sir, I did not understand why at the end you divided by X, ie in 100s , when infact x was to be multiplied . It was y= a + ‘bx’ not b/x. So it should be 1000 x 100. Instead of 1000/100.
Please explain more clearly this part.
John Moffat says
March 21, 2021 at 3:08 pm
Y was written in 1,000’s. X was written in 100’s.
So a was multiplied by 1,000 and b was multiplied by 1,000/100 = 10.
March 21, 2021 at 6:57 pm
I’m sorry, I don’t get the arithmetic.
July 2, 2020 at 5:34 pm
sir , for correcting variable “a” we had to multiply by 1000 , but for b why did we not multiply by 100
sir please explain !!
July 2, 2020 at 6:48 pm
August 30, 2020 at 12:43 pm
I have the same question. Variable B unit cost is in 100’s but it was multiplied by 10 instead of 100?
August 30, 2020 at 1:40 pm
See my answer above.
April 13, 2021 at 11:03 pm
sir, but why are we doing that?
I don’t understand, please explain further.
April 14, 2021 at 8:14 am
You do not need to do it. I only did it to keep the numbers smaller and so speed up the arithmetic.
June 22, 2020 at 11:12 am
I just can’t see how b came to be negative for the formula to be changed from y=a + bx to
y = a – bx.
June 22, 2020 at 2:21 pm
I should have written + and not –
It is typed correctly in the answers printed in the free lecture notes.
June 22, 2020 at 2:46 pm
Noted. Thanks Sir Moffat.
May 31, 2020 at 4:02 am
Thank you so much sir! Bt l hv a question though… The formula says y= a+bx bt on the example in the lecture you subtracted, like the formula changed to y=a- bx. Would you mind to explain why?
March 14, 2020 at 4:47 pm
I was about to post on the last part of the equation but John has answered it, thank you.
March 14, 2020 at 5:28 pm
We are pleased you found it 🙂
July 18, 2019 at 2:23 pm
What is the Interpolation and extrapolation?
July 18, 2019 at 4:47 pm
Interpolation is forecasting within the range of the observations. Extrapolation is forecasting outside the range of the observations.
March 28, 2019 at 11:45 am
Thank you John!
March 28, 2019 at 2:55 pm
You are welcome 🙂
January 12, 2019 at 1:10 pm
In the 15″56,I suppose it should be y=a+bx,but it’s y=32.8572-6.7857x,is it right?
January 13, 2019 at 10:04 am
Sorry – it should be a plus and not a minus!!
I must re-record it (but the printed answer in the lecture notes is correct 🙂 )
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