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4. Here are mass spectrometric signals for known concentrations of methane in H2 : a) Construct a calibration curve. (Don't forget to take the signal

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4. Here are mass spectrometric signals for known concentrations of methane in H2 : a) Construct a calibration curve. (Don't forget to take the signal of the blank into account) b) Replicate measurements of an unknown gave 152.1,154.9.153.9 and 155.1mV. Find the mean concentration (in vol % ) of unknown and its confidence interval at a 95% confidence level

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