A researcher wants to investigate whether mindfulness training improves ability for employees to notice positive experiences in the workplace, and if this differs by gender and/or disposition....

A researcher wants to investigate whether mindfulness training improves ability for employees to notice positive experiences in the workplace, and if this differs by gender and/or disposition.

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  Employees were randomly assigned to one of two groups: no training or a half-day session.
  
  


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  Gender was categorized as male or female.
  
  


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  Disposition was categorized as follows: optimist, pessimist or realist.
  


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  Ability to notice positive experiences in the workplace was quantified using a Likert-based ambulatory assessment. A factorial design was used to analyze the data.
  
  

Question: How many null hypotheses (and thus, F-ratios) are there in this scenario?