HP 39gs Master Manual page 313

Changing into the Solve aplet we can enter a formula which will allow
us to calculate values from the Chi 2 distribution using the function.
UTPC
With a 3x2 contingency table the number of degrees of freedom are 2.
To find the critical χ value, we enter values of 2 for (the degrees of
2
D
0.05
freedom) and 0.05 for (the probability) and then move the highlight to
P
(the value) and press . As it turns out, the required critical
V
value is 5.99 and so we would accept the null hypothesis and conclude
no relationship.
313