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VICTOR TECHNOLOGY
43
¾ Enter the new y value
¾ Touch r x, r
The correlation coefficient, r, can be calculated by touching the x↔y key after
calculating the estimate.
Example
Using the children’s height (y) and weight (x) values from above, estimate the
height (y) of a child weighing 64 pounds (x) and determine the correlation
coefficient. Note: Do not clear the registers after the prior example.
ENTRIES DISPLAY
64 r y, r
43.34
Displays the estimated height of a child weighting
64 pounds.
x↔y
0.77
Displays the correlation coefficient (r) of the data
pairs.
Weighted Mean Values
A set of numbers and their weighted mean may be determined if you know the
weights of the items to be calculated. To do this:
¾ Touch b clear ∑
¾ Enter value of item and touch ENTER
¾ Enter items’ weight and touch ∑+
¾ Repeat until all values are entered, following the item ENTER weight
∑+ formula
¾ Touch r x w to calculate weighted mean of all values
Example
Over a 6-month period, you buy bricks on many occasions to lay a path through
your garden.
• First month: 150 bricks at $0.68 a brick
• Second month: 200 bricks at $0.43 a brick