Thread: confidence level
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Old June 30th, 2009, 03:00 PM
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You're testing a mean \mu, not a proportion/probabilty, p.

I think this should be a one sided test.
You want to 'prove' that the average memory INCREASES.

H_0: \mu =0 vs. H_a: \mu>0.

The rejection region would be (t_{n-1, \alpha},\infty) NOT \alpha/2.
All the probability is in the one side.

BUT some (lame) teachers will be happy with a two-sided CI and then they'll ask you to see if 0 is in that interval.
However a one-sided CI is not lame, it's the same as a one-sided hypothesis
test. But I would just go with the one-sided hypothesis test.
Last edited by matheagle; June 30th, 2009 at 05:23 PM.
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