Probability Distribution Calculator
Normal Distribution, Student's t-distribution, Chi-square Distribution, & C4 table
Table 1:
Normal distribution
(z)
Table 2:
Student's t-distribution
(t)
Table 3:
Chi-square distribution
(
c
2
)
Table 4:
C4 table
(text)
Table 1: The Normal Distribution
For calculating z-scored from probability, or vice versa.
Left tail
Right tail
Middle
Two-tail
z value
probability
Table 2: Student's t-Distribution
Calculate t-values from probability and probability from t-values.
Left tail
Right tail
Middle
Two-tail
d.f.
t value
probability
Table 3: Chi-Squared (
c
2
) Distribution
Left tail
Right tail
d.f.
c
2
value
probability
Table 4: Values of the c
4
constant for x-bar charts
The value of c
4
for subgroup size
n
is shown below.
n
2
3
4
5
6
7
8
9
10
c
4
0.780
0.886
0.921
0.940
0.952
0.959
0.965
0.969
0.973