Visualizing Qualitative vs. Quantitative Data: Videos & Practice Problems

In a workplace ergonomic trial, $540$ office workers were randomized to receive either an ergonomic chair or a standard chair. Researchers recorded whether each worker reported new onset of lower back pain after $6$ months. They found $12$ of $270$ in the ergonomic-chair group and $35$ of $270$ in the standard-chair group reported pain. Identify the response variable and state its type.