Hi

I have just completed A-level maths in 12 months, and am helping out one of my dad's friends at work, who needs to do a bit of maths as part of his apprenticeship course. Its a question about regression, and the formula

y= A + Bx. (Question 2 on attachment)

After inputting the two lines of data into my calculator, it returned values of 5.5575 for B, and 6.1957 for A. But when inputting the x value as 1.1, i.e. first value in the table, i got 12.308, rather than the 12.0 i was hoping for.

I then did the long version, calculating B manually and A manually, and got MINUS numbers, which obviously didn't fit.

I think its a small mistake along the way and i'm hoping someone can spot what i've done wrong because i can't!!

Thanks for reading, sorry its long-winded!!