Quantile-Quantile plots compare the quantiles of a sample distribution against the quantiles of a theoretical distribution (or another sample). If the distributions match, points fall along the diagonal. Deviations from the line indicate the nature and magnitude of departure — S-curves suggest different kurtosis; curved tails indicate skewness.

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{
  "title": {
    "text": "Normal Q-Q Plot — Product Weights"
  },
  "data": [
    {
      "theoretical": -2.33,
      "sample": -2.41
    },
    {
      "theoretical": -1.88,
      "sample": -1.95
    },
    {
      "theoretical": -1.53,
      "sample": -1.58
    },
    {
      "theoretical": -1.28,
      "sample": -1.3
    },
    {
      "theoretical": -1.04,
      "sample": -1.08
    },
    {
      "theoretical": -0.84,
      "sample": -0.82
    },
    {
      "theoretical": -0.67,
      "sample": -0.7
    },
    {
      "theoretical": -0.52,
      "sample": -0.5
    },
    {
      "theoretical": -0.39,
      "sample": -0.36
    },
    {
      "theoretical": -0.25,
      "sample": -0.22
    },
    {
      "theoretical": -0.13,
      "sample": -0.1
    },
    {
      "theoretical": 0,
      "sample": 0.02
    },
    {
      "theoretical": 0.13,
      "sample": 0.15
    },
    {
      "theoretical": 0.25,
      "sample": 0.28
    },
    {
      "theoretical": 0.39,
      "sample": 0.41
    },
    {
      "theoretical": 0.52,
      "sample": 0.55
    },
    {
      "theoretical": 0.67,
      "sample": 0.71
    },
    {
      "theoretical": 0.84,
      "sample": 0.88
    },
    {
      "theoretical": 1.04,
      "sample": 1.09
    },
    {
      "theoretical": 1.28,
      "sample": 1.34
    },
    {
      "theoretical": 1.53,
      "sample": 1.62
    },
    {
      "theoretical": 1.88,
      "sample": 2.01
    },
    {
      "theoretical": 2.33,
      "sample": 2.52
    }
  ],
  "series": [
    {
      "type": "qqplot",
      "theoreticalKey": "theoretical",
      "sampleKey": "sample",
      "fill": "#6366f1",
      "stroke": "#6366f1",
      "strokeWidth": 0
    }
  ],
  "axes": [
    {
      "position": "bottom",
      "title": {
        "text": "Theoretical Quantiles"
      }
    },
    {
      "position": "left",
      "title": {
        "text": "Sample Quantiles"
      }
    }
  ]
}

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Points close to the diagonal reference line confirm the sample follows a normal distribution.

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