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One or two tailed test for t test

How do you determine to use a one tailed or two tailed level of signifigance? What in the question do you base this off of?

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If the null hypothesis is μ = k, it’s a 2-tail test.

If the null hypothesis is μk, or the null hypothesis is μk,it’s a 2-tail test.

Simplify the complicated side; don't complify the simplicated side.

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S2000magician wrote:

If the null hypothesis is μ = k, it’s a 2-tail test.

If the null hypothesis is μk, or the null hypothesis is μk,it’s a 2-tail test.

If the null hypothesis is μk, or the null hypothesis is μk,it’s a 1-tail test.

Also you would use a t-stat when the # of observation is ≤ 30. Correct ?