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Jonathan says

I don’t know if I made a mistake somewhere along in the calculation but i’m having a problem… I used to full figures in thousands for costs and hundreds for units. So, for I have Sum(X) = 2800, Sum(Y) = 420,000, Sum(XY) = 187,000,000, Sum(X^2) = 1,400,000 and Sum(Y^2) = 26,550,000. When I plugged these values into the equation, (the numerator): Square root of [(7*1,400,000)-(2800^2)] X [(7*26,550,000)-(420,000^2)]. My problem is with the values in the last bracket. 420,000^2 is more than (7×26,550,000) which means under the square root I’m getting a negative value. Please Help

johnmoffat says

You have got the sum of Y^2 wrong – it should be 26,550,000,000

Jonathan says

ahh, thanks!

Sandyp says

For Example 2. the ending for b was 6.7857, but when converted to units is was not 67.86. If the units were in hundreds, why is the answer not 678.57

johnmoffat says

The costs are in 1000′s which gives 6785.7 for b, but the units are in 100′s, which makes b 6785.7/100 = 67.857

Sandyp says

Thank u

puntusha says

my biggest wish is to be in london and listen to you in live, thank you a lot

Hoa says

thank you for all the lessons! Wishing you – the lecturer and organiser team all the best!

Accountaholic says

Did you get ‘n’ in Question 1 by putting the numbers in formula for ‘b’? Thanks

johnmoffat says

If you mean question 1 in the test at the end of the chapter, then the question says that there are 11 pairs of data – so n = 11 !!

accakeisha says

SIR I NOTICED THAT YOU MENTIONED THAT YOU SMOKE I WANT YOU TO PLEASE QUIT IT…..BECAUSE IF YOUR NUMBER OF YEARS YOU HAVE LEFT IS BASED ON THE NO. OF CIGARETTES …..CANT AFFORD TO LOSE YOU!!!!YOU ARE MY CHANCE OF SUCCEEDING IN MY EXAMS…..I AM “Y” AND YOU ARE “X” I AM THE DEPENDANT VARIABLE……WITHOUT YOU I SHALL FAIL….lol……..lol………..lol

johnmoffat says

@accakeisha, I will try

filorods2002 says

GOT IT! EXCELLENT! HAVE A HIGHER CHANCE AT PASSING EXAMS! THIS IS DUE TO THE FACT THAT I HAD VERY LIMITED TIME. THE LECTURES ARE REALLY GOOD. UNDERSTOOD IT SO WELL!

mannie1111 says

very very helpful lessons. God bless ya!