2019 Year 12 IB Extended Essays

Table 14: Mean Height of Wheatgrass grown in different concentrations of NaNO3 over a 20-day period Sodium Nitrate Mean height of Wheatgrass/cm ( ± 0.05 cm) Days 0M 0.0068M 0.0274M 0.1095M 0.4381M 0 0 0 0 0 0 2 2.6 2.52 3.28 4.38 3.42 4 5.9 6.66 8.34 9.82 8.86 6 8 8.54 7.36 4.56 0.02 8 11.12 12.98 14.18 14.82 14.54 10 11.6 13.7 14.88 15.56 15.2 12 12.28 14.28 15.44 16.38 15.96 14 12.64 14.92 16 17.04 10.916 16 13.04 15.76 16.52 17.7 17.66 18 13.3 16.22 17.12 18.24 18.36 20 13.5 16.66 17.44 18.78 19.02

Table 15: Standard Deviation for the Height of Wheatgrass grown in different concentrations of NaCl over a 20-day period Sodium Chloride Days 0M 0.0068M 0.0274M 0.1095M

0.4381M

0 2 4 6 8

0

0

0

0

0

1.05 1.64 1.04 1.13 0.89 0.94 0.87 0.91 0.99 0.96

0.57 0.50 1.61 1.32 1.28 1.21 0.98 1.32 1.33 1.32

0.63 0.69 1.01 0.92 0.91 0.87 0.73 0.72 0.64 0.64

0.21 0.63 0.40 0.99 0.89 0.79 0.69 0.76 0.65 0.65

0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04

10 12 14 16 18 20

14