识别异常值

几何画板及绘图内容加载中，请稍等……

2019-12-17 04:20

①本范例演示如何在散点图中识别高于或低于预期的点（异常值）；②涉及的核心数学概念包括散点图、条件概率、几何作图；③作图要点——使用了RandomElement, Append, Shuffle, If, Point, Polygon, Circle等GeoGebra命令和对象；④适合初中及以上学生用于概率统计和数据分析的实践学习。

GeoGebra 命令及参数

RandomElement(adjectives) → adjective
Append("Choose one", choices) → userinput
Shuffle(letters) → shuffledletters, {"\text{B}", "\text{C}", "\text{A}", "\text{D}"}
Shuffle(choices) → shufflechoices, {"\text{B}", "\text{C}", "\text{D}", "\text{A}"}
If(adjective ≟ "\text{higher}", SelectedElement[userinput] ≟ label2, SelectedElement[userinput] ≟ label3) → correct
Shuffle(l1) → shuffledpoints, {(59.5292933895907, 43.7178798803601), (39.6507044269599, 24.4145786453339), (12.5298143475332, 13.685721792114), (56.8145220369809, 46.4326512329699), (76.1572679243259, 45.7539583948174), (19.9954355672102, 27.259578555163), (37.1448402912256, 33.722074006633), (44.7677241597748, 40.4940888991359), (63.9407968375817, 43.7178798803601), (71.0670716381825, 46.9416708615842), (59.6989665991288, 48.129383328351), (44.1851252440031, 35.9892844151546), (64.9588360948104, 51.5228475191133), (50.6287758787486, 44.2228380039961), (81.5868106295455, 57.2917366434091), (16.5012928873186, 15.2264101476412), (81.9261570486217, 53.8982724526469), (32.491092610576, 21.6700607823868), (50.5366132840707, 32.1801016317683), (57.1538684560571, 39.136703222831), (73.272823362178, 56.6130438052567), (24.4961927489473, 16.5390056473116), (57.3235416655953, 33.7071605176114), (31.0241941871876, 36.5916050797593), (12.8691607666094, 19.793957335486), (68.3523002855726, 51.5228475191133), (34.0783119588736, 27.5989249742393), (80, 50), (64.2801432566579, 38.9670300132929), (70.5563621010172, 54.962255728572), (6.76092522323731, 17.0791859828763), (28.3094228345778, 27.9382713933155), (44.7677241597748, 29.6350034886967), (75.6482482957116, 52.0318671477276), (51.045632912685, 37.7793175465261), (28.1397496250397, 32.0104284222302), (13.3781803952238, 24.0357875739389), (7.60929127092788, 11.1406236490423), (24.5766122247393, 24.0357875739389)}
Point(yAxis) → E
Polygon(E, F, I, J) → q1, e, f, i, j
Circle(K_2, 7) → c
Circle(L_2, 7) → d
If(adjective ≟ "\text{higher", label2, label3) → letter