Z = (score-mean)/SEm
SEm = SD/√n
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability of the Z score. How does it compare to .05?
A population =100 and sd=25. A sample (n=150) has X=102. Using 2 tails of the sampling distribution and the .05 criterion.
What is the critical value?
Is the sample in the region of rejection?
What does this indicate about the likelihood of this sample occurring in this population?
What should we conclude about the sample?
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