Xiao Zhou, Xiao Wu, Xiao Deng and Xiao Wang's occupations are: dancers, nurses, teachers and costume designers. I also know that Xiao Zhou's salary is higher than nurses, and Xiao Zheng's salary is lower than Xiao Wu's, dancers. The salary is lower than that of a costume designer, and the costume designer is either Xiao Zheng or Xiao Wang.
Based on the above statement, it is true that four people's occupations can be determined.