Anscombe’s quartet was mentioned in a discussion on the Political Methodology listserv, as to what journalists need to know to stop looking like idiots when they report on social science research:

Counter to your intuition, all four sets of data have the exact same descriptive and bivariate statistics:

Property | Value |
---|---|

Mean of x in each case |
9 (exact) |

Sample variance of x in each case |
11 (exact) |

Mean of y in each case |
7.50 (to 2 decimal places) |

Sample variance of y in each case |
4.122 or 4.127 (to 3 decimal places) |

Correlation between x and y in each case |
0.816 (to 3 decimal places) |

Linear regression line in each case | y = 3.00 + 0.500x (to 2 and 3 decimal places, respectively) |

Source: Wikipedia