Anyone out there with some Maths, well statistics, knowledge?
I've got my exam coming up this week and wondered if anyone could have a glance at this question for me, or one small part of it anyway.
Φ(A) = 0.8
Φ(B) = 0.7
Where Φ is the Phi function and 0.8 and 0.7 are both probabilities found using the "cumulative density function of the normal distribution"
I need to find A and B
I have used the "Inverse Normal Function" table found in Neave's Statistics Tables. The answers do a different way. It then goes on to work out mean and s.d. for which I get very very similar answers.
But I think I've done it the correct way and have more accurate answers.
If anyone could work out A and B for me I would greatly appreciate it. This is where our methods differ and I'll know if my way is correct.