How to calculate standard deviation of a product?

I'm not aware of any built in Excel formula for computing the standard deviation of a product or a quotient like that. For that matter, I cannot find any reference to a simple formula for combining standard deviations like that. If you believe there should be such a formula, I would suggest you peruse your favorite statistical reference or pose this question to a forum or group that is well-versed in statistics. We on this forum are quite good with Excel, but we don't seem to have any regular visitors who know the science of statistics inside and out. If you can give us the statistical formula, we can help you program it into Excel, but I don't know if anyone here will know the formula.

That said, if there is no formula for this calculation, then you can always compute each product/quotient, then use the built in stdev() function on those columns to compute the standard deviation of each product/quotient.

I'm sure it is possible to perform a t-test with only the mean and stdev. You will need to go to your statistics text and get the formula for the t-score, and then you can use the tdist() function to return the desired t-score.

Did I misinterpret your question? Is your question really about propagation of error (where you are using the standard deviation as your measure of error)? http://chemwiki.ucdavis.edu/Analytic...ation_of_Error Does that describe the answer to your question?

No there is not a built in Excel function for propagation of error. (I'm not even sure that dedicated statistics packages like Minitab include built in propagation of error functions.)

As a beginner in statistics headed towards a masters degree, I would strongly encourage you to become proficient in statistics. As a chemist, I look back on my schooling and wish I had taken a couple of statistics classes. If you are in a position to do so, I would talk with your advisor about this. It is my opinion that, if you are going into a field where your master's thesis is asking you to do propagation of error and Tukey's tests, you would be well served by taking a couple of courses that will give you a solid understanding of at least basic statistics.