Q4. (15 pts) The response scale of a molecular absorption spectrometer is tested at specific wavelength with a standard solution which has an absorbance given as 0.250. Five measurements of the absorbance with the spectrometer give average of 0.261 and standard deviation of 0.095. a) Find the confidence interval for the mean absorbance at 95% confidence level for 5 replicates. b) What would be the confidence interval at the 95% confidence level for the mean absorbance if the given average and standard deviations were obtained for 25 replicates. c) Is there evidence of systematic error for twenty-five measurements of the absorbance with the spectrometer at 95% confidence level? Explain your findings using the following graph