# Calculate the loq the limit of quantitation is solved

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Calculate the LoQ: The limit of quantitation is solved by using 10 times standard deviation divided by the slope.
5.For each group, calculate the concentration of the unknown by the method of external standardsusing your graph from question 2 and report as average standard deviation.
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6.For each group, calculate the concentration of the unknown by the method of standard addition and report as average standard deviation.7.Using statistical hypothesis testing (type 3: same sample, different method. Excel calls this t-test: Paired Two Samples for Mean) decide if the methods produce statistically similar or different results. Is external standardization different from the standard addition method? You have to put the data in excel following Table 3 below.Add as many rows as needed to include all class data. Remember, the data must bepaired, so if one point is discarded as an outlier you must discard both methods for that group. In other words, if a point loses its pair it can’t be included in the t-test.Group #Conc. of Unknown byExternal StandardsConc. ofUnknown byStandardAddition12348.Discuss the use of each of all threedifferent calibration methods (external standards, internal standards and standard addition). When is it appropriate to use them? Provide specific examples of situations where they would be most useful. 6
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