Posted by Anonymous on Tuesday, June 12, 2012 at 8:57pm.
Acceptance or rejection of the null hypothesis depends on what level of significance you are using (e.g., P≤.05, P≤.01) and whether you are using a one-tailed or two-tailed test. If the Z score has that probability or less, reject the null hypothesis. If not, accept the null hypothesis.
We test the hypothesis to determine the probability that the differences found are due only to chance.
If you understand the concept, examples abound. I'll let you find them.
Random sample of n=25 scores is obtained from a population of a µ=70 .A treatment is administered to individuals in the sample and after treatment the sample mean M=78 with a standard deviation of s=20
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