192
CHAPTER 7
for US
<Example 3>
Find the value of x when the probability of example 1 is 0.8.
Key operation:
F
0 3 0.8
,
60
,
6
) ®
Thus, all of the probabilities for data with x up to 65 are
0.8.
[04 pdfT (]: Finds the probability density of a specified value x for T distribution with n
degrees of freedom (cannot be entered using lists).
Format: pdfT (value of x, degrees of freedom)
* Degrees of freedom is a positive real number.
If decimals are used for the degrees of freedom, the closest calculation is executed using the
supplied degrees of freedom as an integer.
<Example 4>
Find the probability density of T distribution with 9 degrees of freedom when “x = 2.5”.
Key operation:
F
0 4 2.5
,
9
) ®
* An error may occur when entering an extremely large number
(exceeding 100, etc.) for the degrees of freedom.
[05 cdfT (]: Finds the T distribution probability within the specified range of x for T
distribution with n degrees of freedom (cannot be entered using lists).
Format: cdfT (lower limit, upper limit, degrees of freedom)
* Degrees of freedom is a positive real number.
If decimals are used for the degrees of freedom, the closest calculation is executed using the
supplied degrees of freedom as an integer.
<Example 5>
Find the probability of range X = 0.5 to 3.2 for T distribution with 9 degrees of freedom.
Key operation:
F
0 5 2.5
,
9
) ®
,,
,
,
EL-9650-(07)En (178-196) 8/1/00, 9:08 AM192
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