how is this done

2) [30 marks] The level of phthalates in 20 water samples was determined by an old HPLC instrument and a new HPLC instrument. Compare the 2 data sets using graphed regression analysis in Excel to see if the methods can be determined as equal. Discuss your conclusion. You should provide a screengrab of your graph(s). Old HPLC 10.1 New HPLC 10.5 1 2 11.3 11.0 UND NA 3 12.4 11.4 4 9.8 9.3 5 8.3 8.6 9.2 6 8.9 7 10.2 8 10.6 10.3 10.3 9.3 10.9 9 8.9 10 11 10.8 11.5 12.4 11.0 12 12.1 13 10.2 10.8 14 9.8 9.9 15 8.4 8.4 7.9 8.0 16 17 10.4 10.9 18 9.8 10.5 19 9.3 10.6 20 11.2 1