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# stats-- simplifying question (from a hypothesis test with a normal distribution) Watch

1. with the given conditions of same variances and sample sizes, how does the RHS of the top Prob. simplify into 1.96*(2)^1/2? A

Also, shouldn't the probability be 0.00280 according to the normal distribution?
2. (Original post by zomgleh)

with the given conditions of same variances and sample sizes, how does the RHS of the top Prob. simplify into 1.96*(2)^1/2? A
Replace m with n and sigma x with sigma y, and see what you can do. It's not that difficult.

Also, shouldn't the probability be 0.00280 according to the normal distribution?
You're forgetting the modulus sign round the Z, so it's twice that.
3. (Original post by ghostwalker)
Replace m with n and sigma x with sigma y, and see what you can do. It's not that difficult.

You're forgetting the modulus sign round the Z, so it's twice that.
THANK YOU! I overlooked the sqrt of 2 in the denom when I put those conditions earlier.

Any chance you can help me with this one please?-- http://www.thestudentroom.co.uk/show...1#post42182461
4. (Original post by zomgleh)
Any chance you can help me with this one please?-- http://www.thestudentroom.co.uk/show...1#post42182461
Posted a reply there, but I'm not well up on multivariate calculus. DFranklin does know what he's talking about.

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