How do I tell if it's statistically different?

IC range of 5 orders of magnitude. disadvantage: expensive ($40000-$100000), because each detector costs $1000-$2000 and there is a detector for each element. The more information that you give me the more marks I can give you! If you answer an extra question the lower mark in that section will be thrown out. Statistics and Atomic Spectroscopy SECTION A (Answer ONE question, 5%) la) Two students have obtained the following mean values for the same sample using a well established method. Is there a statistically important difference between these two means at the 99% confidence level? Student 1: mean = 78.8 ocmol/L, 5 measurements Student 2: mean = 83.5 ocmol/L, 6 measurements The well established standard deviation of the method = 4.0 amol/L