类型

$N_h/个$

$W_h$

$n_h/个$

${\overline{y}}_h/斤$

${\overline{x}}_h/斤$

${\overline{X}}_h/斤$

$s_{y_h}^2/{斤}^{\text{2}}$

$s_{x_h}^2/{斤}^{\text{2}}$

$s_{y{x}_h}/{斤}^{\text{2}}$

平原

99

0.33

10

583

561

568

1809

1503

1643

丘陵

138

0.46

14

445

437

439

1990

1937

1948

山区

63

0.21

6

290

274

271

1989

1892

1936