From a sample of 10 observations, the following results were obtained: Y i = 1,110 X i

From a sample of 10 observations, the following results were obtained:

ΣY_i = 1,110     ΣX_i = 1,700     ΣX_iY_i = 205,500

ΣX_i² = 322,000                       ΣYⁱ² = 132,100

With coefficient of correlation r = 0.9758. But on rechecking these calculations it was found that two pairs of observations were recorded:

Y         X                                                 Y         X

  90        120      instead of                     80        110

140        220                                            150      210

What will be the effect of this error on r? Obtain the correct r.