Calculators for Statistical Table Entries
z to P Calculator
For any given value of z, this section will calculate
 º
 the respective onetailed probabilities of —z and +z;

 º
 the twotailed probability of±z;

 º
 and the proportion of the normal distribution falling between —z and +z.

To proceed, enter the value of z in the designated cell and click «Calculate». Note that the programming for this section is able to perform meaningful probability calculations only for cases where z
<5.


Click here to see the details
of the sampling distribution
to which any particular value
of z belongs.

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ChiSquare to P Calculator
For values of df between 1 and 20, inclusive, this section will calculate the proportion of the relevant sampling distribution that falls to the right of a particular value of chisquare. To proceed, enter the values of chisquare and df in the designated cells and click «Calculate».
Click here to see the details of the sampling
distribution to which any particular value of
chisquare belongs. At the prompt, enter the
appropriate value of df.
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t to P Calculator
This section will calculate the onetail and twotail probabilities of t for any given value of df. To proceed, enter the values of t and df in the designated cells and click «Calculate».
Click here to see the details of the sampling
distribution to which any particular value of t
belongs. At the prompt, enter the appropriate
value of df.
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r to P Calculator
If the true correlation between X and Y within the general population is
rho=0, and if the size of the sample, N, on which an observed value of r is based is equal to or greater than 6, then the quantity
 t =
 r sqrt[(1—r^{2})/(N—2)]

is distributed approximately as t with
df=N—2. Application of this formula to any particular observed sample value of r will accordingly test the null hypothesis that the observed value comes from a population in which
rho=0.
To assess the significance of any particular instance of r,
enter the values of
N[>6] and r into the designated cells below, then click the 'Calculate' button.