Table 4. Anscombe's quartet (summary statistics).

The data series x, y (plotted on the horizontal and vertical axis, respectively, in Fig 3) become almost indistinguishable when computing simple summary statistics.

	Series A	Series B	Series C	Series D
Arithmetic mean $\overline{x}$	19.0	19.0	19.0	19.0
Variance $s_x^2$	11.0	11.0	11.0	11.0
Arithmetic mean $\overline{y}$	17.5	17.5	17.5	17.5
Variance $s_y^2$	14.127	14.128	14.122	14.123
Pearson CC ρx,y	10.816	10.816	10.816	10.817

Abbreviation: CC, correlation coefficient.