From a sample of 10 observations, the following results were obtained: with a coefficient of correlation . But on rechecking these calculations, it was found that two pairs of observations were...

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

with a coefficient of correlation . But on rechecking these calculations, it was found that two pairs of observations were recorded:

instead of

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