When using a one-way within-groups anova, the variability due to individual differences is reduced resulting in a f statistic, making it to reject the null hypothesis.

To find the inverse of a number a, one can use the equation f(c) = a-1/c=0 where c is the inverse of a use the secant method of finding roots of equations to find the inverse of a = 2.5 ,er = 0.001%