those in high socioeconomic status.  To evaluate this you use the data below to calculate a Chi-Square (X2).

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As a researcher, you are interested if there is a significant difference in immunizations in those in low socioeconomic status and those in high socioeconomic status.  To evaluate this you use the data below to calculate a Chi-Square (X2). 

  Socioeconomic Status Socioeconomic Status Total
  High  Low  
Immunized 1000 500 1500
Not Immunized 250 750 1000
Total  1250 1250 2500
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