| Statistics Toolbox | |
Student's t cumulative distribution function (cdf).
Syntax
P = tcdf(X,V)
Description
P = tcdf(X,V)
computes Student's t cdf at each of the values in X using the corresponding degrees of freedom in V. Vector or matrix inputs for X and V must be the same size. A scalar input is expanded to a constant matrix with the same dimensions as the other inputs. The parameters in V must be positive integers.
The result, p, is the probability that a single observation from the t distribution with 
degrees of freedom will fall in the interval (-
x].
Examples
Suppose 10 samples of Guinness beer have a mean alcohol content of 5.5% by volume and the standard deviation of these samples is 0.5%. What is the probability that the true alcohol content of Guinness beer is less than 5%?
t = (5.0 - 5.5) / 0.5;
probability = tcdf(t,10 - 1)
probability =
0.1717
See Also
| | tblwrite | tdfread | |