In the gravimetric analysis of a calcite sample, CaO analysis results, as %CaO; 55.95, 56.00, 56.04, 56.08 and 56.23. Is the value 56.23, which is included in the analysis results and does not appear normally, due to a random error and should it be discarded at the 90% confidence level? (Qtable = 0.64)