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Normal Distribution Question help

James... Avatar
5y, 10m agoPosted 5 years, 10 months ago
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.

Many thanks

James... Avatar
5y, 10m agoPosted 5 years, 10 months ago

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(2) Jump to unreadPost a comment
A = 1st letter of the alphabet

B = 2nd letter of the alphabet

No problem.
Sensible answers please ;-)

I need to pass this module to carry on my degree next year and I don't think she'd appreciate putting that haha!!

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