Posted by Williams on Saturday, November 30, 2013 at 1:42pm.
Consider the following hypothesis statement using alpha = .05, and data from two independent samples:
Ho: µ1  µ2 = 0
Ha: µ1  µ2 not equal to 0
X1 = 237, X2 = 218
¬1 = 54, ¬2 = 63
n1 = 42, n2 = 35
a) Calculate the appropriate test statistic and interpret the result. b) Calculate the p value and interpret the result.

Math.stat help :(  PsyDAG, Sunday, December 1, 2013 at 12:19pm
Ho: mean1 = mean2
Ha: mean1 ≠ mean2
Since these are just samples rather than the whole population, µ is an inappropriate designation. µ is parameter rather than a statistic.
Z = (mean1  mean2)/standard error (SE) of difference between means
SEdiff = √(SEmean1^2 + SEmean2^2)
SEm = SD/√n
If only one SD is provided, you can use just that to determine SEdiff.
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability related to the Z score.
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