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The blue–seven phenomenon is a social phenomenon in which a purported statistical majority of people in the US choose the color blue and number seven when asked to randomly select a color and a single digit number. The cause of the cognitive bias is not understood,[1][2][3][4] though it has been posited that both colors and numbers are imbued with layers of significance.[5]
The existence of the phenomenon has been disputed.[6][7] Outside of the US these preferences may not hold.[8][9] In other countries, differences occur, particularly in Northern Ireland where a noted bias of green and eight results in a green–eight phenomenon.[citation needed]
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