2019 Year 12 IB Extended Essays

Table 16: Standard Deviation for the Height of Wheatgrass grown in different concentrations of NaNO3 over a 20-day period Sodium Nitrate Days 0M 0.0068M 0.0274M 0.1095M

0.4381M

0 2 4 6 8

0

0

0

0

0

0.67 1.90 1.04 1.90 1.81 1.74 1.62 1.54 1.52 1.52

1.05 0.74 1.61 1.16 0.78 0.74 0.75 0.94 1.01 0.95

0.33 0.69 1.01 1.35 1.40 1.36 1.28 1.31 1.34 1.30

0.75 0.45 0.40 1.02 0.97 0.92 0.87 0.88 0.90 0.72

0.75 0.78 0.04 1.38 1.35 1.33 1.34 1.48 1.33 1.37

10 12 14 16 18 20

15