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Thanks berrymucho. So that means I would have to look up the confidence level for 0.54 standard deviations of s on-tailed tes, right? I am just wondering how we would answer the question when the lookup table usually only has a few options for the number of standard deviations (the usual ones...

Hi David, I understand how to calculate a confidence interval for a given level of confidence (e.g. 95%), but I don't understand how to answer the question "How confident can you be that the true mean is above/below a certain number?". This is one of the sample questions in Miller Chapter 7...

Thanks David! That's very helpful.

So far I have noticed that some end of chapter problems make it difficult to get to the correct answer with my HP12c. For example, 20! Divided by 18!. I am pretty committed to the HP12c, and since this is an approved calculator, is it safe to assume that GARP won't ask questions that have digits...