Section 4: Statistics Functions

51

 

 

 

 

 

 

 

 

X

NITROGEN APPLIED

0.00

20.00

40.00

60.00

 

80.00

(kg per hectare *), x

 

 

 

 

 

 

 

 

 

GRAIN YIELD

 

 

 

 

 

 

Y

(metric tons per

4.63

4.78

6.61

7.21

 

7.78

 

hectare), y

 

 

 

 

 

 

 

 

 

 

 

 

 

 

*A hectare equals 2.47 acres.

 

 

 

 

 

 

Keystrokes

´CLEAR ∑

´•2

4.63 v

0z

4.78 v

20z

6.61v

40z 7.21 v

60z 7.78 v

80z l3

l4

l5

l6

l7

Display

 

0.0000

Clears statistical storage

 

registers (R2 through R7 and

 

the stack).

0.00

Limits display to two decimal

 

places, like the data.

4.63

 

1.00

First data point.

4.78

 

2.00

Second data point.

6.16

 

3.00

Third data point.

7.21

 

4.00

Fourth data point.

7.78

 

5.00

Fifth data point.

200.00Sum of x-values, Σx (kg of nitrogen).

12.000.00 Sum of squares of x-values, Σx2.

31.01Sum of y-values, Σy (grain yield).

200.49Sum of squares of y-values,

Σy2.

1,415.00 Sum of products of x- and y-values, Σxy.