Question

The following data shows the results of the determination of chromium in organic materials compared by two different methods.

Pine Needles:              Method 1         mean=2.15                  SD=0.26

                                    Method 2         mean=2.45                  SD=0.14

Beech Leaves              Method 1         mean=5.12                  SD=0.80

                                    Method 2         mean=7.27                  SD=0.44

Aquatic Plant              Method 1         mean=23.08                SD=2.63

                                    Method 2         mean=32.01                SD=4.66

In each case, the mean is the average of 5 values.

For each material, test whether the mean results obtained by the two methods differ significantly. Do on EXCEL.

Answer 1