9 Gradebook ) 2/5/2018 10:00 PM O 37.4/502/5/2018 12:56 PM Print CalculatorPerio

Question

9 Gradebook ) 2/5/2018 10:00 PM O 37.4/502/5/2018 12:56 PM Print CalculatorPeriodic Table estion 27 of 29 Analysis of the percent copper in a chalcopyrite ore sample gave the following results for five replicate measurements. 29 49, 29,61, 29, 45, 29.79, and 29.50 % Cu (w/w). Which of the measurements is a possible candidate for testing as an outlier? Critical Values (Q) for the Q-Test at Various Confidence Levels 29,49 % 29.61 % 2945% 2979% 99% 0.994 95% 90% 0941 0.970 0.765 0.829 0.926 0.642 0.560 0.625 0.7 0.507 0.568 0.680 0.468 0.526 0.634 0.437 0.493 0.598 0.710 0.821 29.50 % Calculate the Q value for testing this candidate as an outlier by the Q-test Number 10 0.4120.4660.568 Can this candidate be considered an outer with 90% confidence by the Q-test? (see the table for values of Q Yes oPrevios ®Gve Up & View Sohion 9Check Answer Next Exit Last modified: Tuesday, 2 January 2018, 12:34 PM terms of use

Explanation / Answer

rearrange data

29.45,29.49,29.50,29.61,29.79

n=5

we hypothesize 29.45 is an outlier

Q=GAP/RANGE

Q=0.04/29.79-29.45

Q=0.04/0.34

Q=0.118

With 5 observations

Q CRIT FOR 90%=0.642

Q<Q CRIT

FAIL TO REJECT NULL HYPOTHESIS

ACCEPT NULL HYPOTHESIS

29.45 IS NOT AN OUTLIER

ANSWERS

29.45%

Q=0.118

NO

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