Vega-Lite — A/B test lift

{
  "$schema": "https://vega.github.io/schema/vega-lite/v5.json",
  "data": {"values": [
    {"arm":"A","mean":0.082,"ci":0.006},
    {"arm":"B","mean":0.094,"ci":0.007}
  ]},
  "transform": [
    {"calculate": "datum.mean - datum.ci", "as": "lo"},
    {"calculate": "datum.mean + datum.ci", "as": "hi"}
  ],
  "layer":[
    {"mark":"bar","encoding":{"x":{"field":"arm","type":"nominal"},"y":{"field":"mean","type":"quantitative","title":"conversion rate"}}},
    {"mark":{"type":"errorbar","ticks":true},"encoding":{
      "x":{"field":"arm","type":"nominal"},
      "y":{"field":"lo","type":"quantitative","title":"conversion rate"},
      "y2":{"field":"hi"}
    }}
  ]
}