HP 12C Financial Programmable Calculator Manual do Utilizador descarregar pdf (Página 112)

111

If there is a close agreement between the observed and expected

frequencies, x

will be small. If the agreement is poor, x

will be large.

The following keystrokes calculate the x

statistic:

1. Press CLEAR .

2. Key in the first O

value and press .

3. Key in the first E

value and press 0 0

4. Repeat steps 2 and 3 for all data pairs. The x

value is displayed.

Example 1: A suspect die from a Las Vegas casino is brought to an

independent testing firm to determine its bias, if any. The die is tossed 120

times and the following results obtained.

The expected frequency = 120 throws / 6 sides, or E = 20 for each

number, 1 thru 6. (Since E is a constant in this example, there is no need

to store it in R

each time.)

Number 1 2 3 4 5 6

Observed Frequency 25 17 15 23 24 16

Keystrokes Display

CLEAR

20 0

1.25

17 20

1.70

–()

---------------------

i 1=

∑

1 2 ... 107 108 109 110 111 112 113 114 115 116 117 ... 164 165

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HP 12C Financial Programmable Calculator Manual do Utilizador Página 112