1. hypthosis question help

What are the key terms in a verbal hypothesis that signify whether you are conducting a one–tailed or two-tailed test? I'm thinkign the answer to this would be The one tail test that denotes that your alternate hypothesis is greater then less then to something and a two tail usually mean not equal to your null hypothesis. Not sure??

Could gender be used as a variable in the creation of a test of two populations? Why or why not?

When would you use a two population test with a small sample size at your place of employment, in your education, or in politics?

2. A left tailed test is used when the alternative hypothesis involves a less-than inequality symbol. A right tailed when it involves a greater-than symbol. And a two tailed when it involves a not-equal to.

Gender can be used in a hypothesis test of two populations if the samples are random, independent, and greater than 30. Here, one sample would consist of more than 30 randomly chosen males and the other of more than 30 randomly chosen females. The 30 or more condition can be eliminated if the populations are normally distributed and have a known standard deviation.

I would use a two population test in my statistics class.