Question: When using a t-test of the difference between two means (unequal variances) how do we know if we use a one-tailed or two-tailed p-test? When

When using a t-test of the difference between two means (unequal variances) how do we know if we use a one-tailed or two-tailed p-test?

When using a matched pairs t-test how do you know when to use a one-tailed or two tailed p-test?

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