HP 30b - Business Professional Calculator - Page 30

Mathematical Calculations22
1. Enter the two degrees of freedom by typing each number followed by I or
=.
2. Type the number for which you want to calculate the probability, or, for the inverse, the
probability for which you want the number.
3. Navigate to the appropriate function in the Probability sub-menu of the Math menu. See
Table 2-6. Note: the examples below are calculated with Chain set as the operating
mode.
Table 2-6 Probability Example
Keys Display Description
10I
8I
:s
Enters 10 degrees of freedom and the number
for which probability is to be calculated.
Opens the Math menu.
<<I
<<<<
Selects the Probability menu item and scrolls to
Chi
2.
.
I or =
Validates the result.
Table 2-7 Inverse Probability Example
Keys Display Description
10I
0.37
12I
:s
Enters 10 degrees of freedom and the
probability. Opens the Math menu.
<<I
<<<<
<
Selects the Probability menu item. Scrolls to
Chi
2-1
.
I or =
Validates the result.