نماذج من الاختبارات والاجابات

• المقرر الدراسي: تحليل البيانات 406 GEO

Here are the first two points of Qassim soil sample dataset:

Coordinates       Rock      Cd      Cu        Pb       Co     Cr      Ni        Zn

1 (2.386, 3.077) Sand stone   1.740    25.72    77.36     9.32    38.32   21.32    92.56

2 (2.544, 1.972) Sandstone    1.335    24.76     77.88     10.00   40.20   29.72   73.56

1. The distance between the points;

2. The difference between the Pb values;

3. The semivariance between the Pb values;

 

 

Answer

1. √(2. 386 − 2.544) 2 + (3. 077 − 1.972) 2 = 1.1162 km

2. 77. 36 − 77. 88 = −0.52 mg kg-1

3. 0. 5 · (77. 36 − 77.88) 2 = 0. 1352 (mg kg-1)2