I'm prepping for an exam and I can't seem to figure out how to calculate the P-value when you're comparing two samples in Difference Between Two Means and Comparing the Means of Two Related Populations.
I can find the t statistic and confidence intervals fine but one of the practice questions asks for the P-value. And whenever I look up how they do it in the book, they say they plugged it into Excel which we can't use... so I look back to how they original calculate it and they find the z-stat first. But finding that requires: x-mu / stan dev or xbar - mu / stan dev / sqrt(n)
I only have sample data and not population mean or population standard deviation. I tried estimating it using the sample numbers but I'm not getting the same answer as the book gives. Help?
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