Questions 1. The true percentage concentration of lead at a farm site in Oyo State, as determined by
AAS, was 6.50. An environmental chemist determined the percentage concentration of lead
at the farm site and reported the following percentage values: 6.65, 6.08. 8.68, 6,50.6.52.
6.99, 6.57, 6.49, 6.62 and 6.54.
i. Should the suspected (questionable) value be rejected? (Q-critical for 10 determinations
is
0.41).
ii. Use the above data to determine the: (a) absolute error, (b) percentage relative error, (c)
standard deviation (error), (d)standard deviation of the mean, (e)coefficient of variation
(CV) and (c) variance.