Internal function. Given the probability distribution of independent test statistics T1 and T2, the function finds the joint distribution of T1, T1+T2.

1 | ```
jointcrit(p1, p2, alpha = 0.05)
``` |

`p1` |
The probability distribution of the test statistic T1 taking on values 0, 1, 2,..., maximum value |

`p2` |
The probability disribution of the test statistic T2 taking on values 0, 1, 2, ..., maximum value |

`alpha` |
The significance level at which the test is conducted. |

Matrix which contains for each possible value of t1 and t2, information about the probability of T1>=t1, T1+T2>=t1+t2.

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