In an investigation into the role of auxin in phototropism, the effect of an auxin-transport inhibitor, naphthylphthalamic acid (NPA), on the phototropic curvature of oat coleoptiles was studied. Ten control coleoptiles were treated with distilled water, and ten treated coleoptiles were treated with NPA. All coleoptiles were exposed to unidirectional light from one side for 6 hours. The angle of curvature towards the light (measured in degrees) was recorded for each coleoptile.
The results are shown in the table below:
ColeoptileControl curvature (∘)NPA Treated curvature (∘)125.45.1224.84.8326.25.2425.04.9525.623.6624.55.0725.84.8825.25.1924.94.91025.65.2Average25.3? \begin{array}{c|c|c} \text{Coleoptile} & \text{Control curvature } (^{\circ}) & \text{NPA Treated curvature } (^{\circ}) \\\hline 1 & 25.4 & 5.1 \\ 2 & 24.8 & 4.8 \\ 3 & 26.2 & 5.2 \\ 4 & 25.0 & 4.9 \\ 5 & 25.6 & 23.6 \\ 6 & 24.5 & 5.0 \\ 7 & 25.8 & 4.8 \\ 8 & 25.2 & 5.1 \\ 9 & 24.9 & 4.9 \\ 10 & 25.6 & 5.2 \\\hline \textbf{Average} & \textbf{25.3} & \textbf{?} \end{array} Coleoptile12345678910AverageControl curvature (∘)25.424.826.225.025.624.525.825.224.925.625.3NPA Treated curvature (∘)5.14.85.24.923.65.04.85.14.95.2?The results for the NPA Treated coleoptiles contain one anomalous result. Identify the anomalous result and calculate the correct average curvature for the NPA Treated coleoptiles. Show your working.
