Table 1. Calibration Data.ConcentrationGroup 1AbsorbanceGroup 2 AbsorbanceGroup 3 AbsorbanceGroup 4 AbsorbanceAverageStdevBlank4 ppm6 ppm8 ppm10 ppm15 ppm20 ppm100 ppm Unknown Unknown + 10 ppm SpikeResults and Discussion – 10 points each. 1.Examine the pooled class data and reject outliers using the Grubb’s test.2.Provide an external calibration curve of the linear range, with cleaned up formatting and appropriate error bars. To add error bars, click on your graph and pick Chart Tools – Designon the Excel tool bar (top right). Go to Add Chart Elements drop down menu and select error bars and more error bars options. Choose vertical error bars, both directions and the error amount to be a custom range. Put in the cells thatcontain the standard deviation of your absorbencies into the + and - custom fields. Below is a representative external calibration with y-error bars representing the standard deviation in the pooled class data. Remember, the linear function should beused to describe only the linear portion of the graph. Do not include non-linear data points in your curve. Format the axes and trend line data to the appropriate number of significant figures.