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A study was conducted to examine how stress varies across different occupations (teacher, office-worker, labourer). It was hypothesised that teachers would have more stress than both office-workers and labourers. It was also hypothesised that office-workers would have more stress than labourers. Which of the following would be an appropriate statistical test to conduct, which addresses these hypotheses? O Multiple Regression O Mixed ANOVA O Single Factor ANOVA O Factorial ANOVA O Within Subjects ANOVA