HP 12C#ABA hp 12c_solutions handbook_English_E.pdf - Page 112
Number, Observed Frequency, Keystrokes, Display
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n ∑ x2 = (---O----i--E-----i--E----i-)- i=1 If there is a close agreement between the observed and expected frequencies, x2 will be small. If the agreement is poor, x2 will be large. The following keystrokes calculate the x2 statistic: 1. Press CLEAR . 2. Key in the first Oi value and press . 3. Key in the first Ei value and press 0 0 . 4. Repeat steps 2 and 3 for all data pairs. The x2 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. Number 1 2 3 4 5 6 Observed Frequency 25 17 15 23 24 16 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 R0 each time.) Keystrokes Display CLEAR 25 1.25 20 0 0 17 20 1.70 0 111