Briefly describe one way you could use each of the models in a research setting.

1. Simple linear regression
2. Multiple regression
3. Factorial analysis of variance
4. Multivariate analysis of variance
5. Factor analysis

Assume that you are conducting one of the statistical analysis mentioned above, and you must decide between using a one or two-tail test. When will be appropriate to use a one-tail test? When will be appropriate to use a two tails test?