Before believing a study look at it's methodology

Before believing a study take a look at its methodology

For example, in 2017 budget airline Ryanair announced that 92% of their passengers were satisfied with their flight experience. It turned out that their satisfaction survey only permitted the answers, ‘Excellent, very good, good, fair, OK’.

Excerpt from: The Art of Statistics: Learning from Data by David Spiegelhalter

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