HP 12C Financial Programmable Calculator User Manual download pdf (Page 118)

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3. Repeat step 2 for each new case.

Example: Find Q(x) for x = 1.18 and x = 2.1.

Covariance

Covariance is a measure of the interdependence between paired

variables (x and y). Like standard deviation, covariance may be defined

for either a sample (S

) or a population (S'

) as follows:

= r * s

* s

= r * s'

* s'

The following procedure finds the covariance of a sample (S

) and of a

population (

1. Press CLEAR .

2. Key in the y-values and press .

3. Key in the

x-values and press . Repeat steps 2 and 3 for all data

pairs.

4. Press to obtain the value of S

5. Press 1 1 1 to obtain S'

Example 1: Find the sample covariance (S

) and population covariance

(

) for the following paired variables:

Keystrokes Display

1.18

0.12 Q(1.18)

2.1

0.02 Q(2.1)

26 30 44 50 62 68 74

92 85 78 81 54 51 40

Keystrokes Display

CLEAR

92 26

85 30

78 44

81 50

7.00 Total number of entries.

1 2 ... 113 114 115 116 117 118 119 120 121 122 123 ... 164 165

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HP 12C Financial Programmable Calculator User Manual Page 118