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Analysis of variance with interaction term

I have four categories, for instance, age, sex, zone and weight. I am asked if the average weight of the population differs among the four zones, and the sexes. I performed a one way anova test for weight and zones then another for weight and sex. Is this correct? I then performed a one way anova test of the zones versus age class since I was asked if ages were distributed among the zones.

The last two questions are based on interactions. I decided to try and perform a two way anova test for age, weight and zones however the groups are not even. So I decided to perform a general linear model. Is this correct? I am finding it difficult to decide what anova test to perform. Can you please give me some insight?


Solution Summary

The solution gives step by step procedure for ANOVA with interaction term. Null hypothesis, alternative hypothesis, critical value, test statistic and P value are given with interpretations.