The analysis of a calcite sample yielded CaO percentages of 55

please see the attached file.

QUESTION:

ANSWER:
Based on the Q-test the Qcalculated is less than the Qtabulated for the fifth value. Thus, the last value (56.23) has to be retained.

Using the Q Test:

For identifiying and rejecting the outliers in the data. Arrange the values in the increasing order and calculate the Q by using the formula:
Q = gap/ range
Where, gap = 56.23 - 56.08; range = 56.23 - 55.95
Thus,
Q = 0.15/0.28 = 0.535 which is less than the Q tabulated value for N=5 thus, keep the 56.23 at 90% confidence level.

Answered: 11/04/2006 15:40pm