learning rate

You will have to tell me which exam you are referring to!

Please I'm referring to the new ACCA F5 Mock Exams(Objective test exams). Question 11

I assume that you are meaning our mock exam (and not the ACCA specimen exam). As it states on the page before the exam, questions are selected at random from a bank of questions and so you will not get the same questions, in the same order, each time you attempt it. So 'question 11' means nothing to me. In future, as it says before the test, you must copy the question here if you have a problem. However, I think I have found the one that you are referring to. The average time per unit if they make 2 units is (8+6)/2 = 7 hours. So the learning rate is 7/8 = 87.5% (The doubling rule applies to the average time per unit) The free lecture on learning curves may help you.

ok..i got 87.5% too using the formula: y=ax^b, although im not sure if its the right way to do it, plus its also time consuming: the values which i used were as follows: y= 7 (av. cumulative time) a=8 (since this is the time req for the 1st one) x=2 (for # of units) calculations to get b: y=a(x^b) 7=8(2^b) 7/8=2^b b=log(7/8) / log2 b=-.19264... since b=logLR/log2, therefore -.19264*log2=logLR logLR=-0.0579.... so LR = 10^-0.0579 = 0.875 CORRECT?

Well, yes it is obviously correct - I wrote in my previous reply that the answer is 87.5% However, much easier is to use the doubling rule as I did in my previous reply (and you can be tested specifically on the doubling rule rather than on using the formula).

I am surprised if the question has both answers in the choices. However, if it does then 84.3% is the better choice. The reason is that you would not expect the learning rule to work precisely in practice, and the more results you looked at the better.

You are welcome :-)