Hi,
I work in a phytochemistry lab where substances are analysed by gas chromotography to estimate quantities of individual compounds in a sample. I want to work out how much variation there is in our process. To do so, I prepared three samples from the same source of tea tree oil, and injected each sample six times into the GC machine. Each injection was analysed for the quantity of 15 different compounds. So for each compound there are 18 measurements. I've calculated the mean and standard deviation for each of these.
Normally we would only analyse a given sample once. I want to use the above data to be able to say that the score we measured for a given compound is accurate within a given range. How can I work out what that range is?
I work in a phytochemistry lab where substances are analysed by gas chromotography to estimate quantities of individual compounds in a sample. I want to work out how much variation there is in our process. To do so, I prepared three samples from the same source of tea tree oil, and injected each sample six times into the GC machine. Each injection was analysed for the quantity of 15 different compounds. So for each compound there are 18 measurements. I've calculated the mean and standard deviation for each of these.
Normally we would only analyse a given sample once. I want to use the above data to be able to say that the score we measured for a given compound is accurate within a given range. How can I work out what that range is?