Question 8 1 pts A quality control lab has just purchased a new analytical instr

Question

Question 8 1 pts A quality control lab has just purchased a new analytical instrument to replace the old one that has served for more than 10 years. Daily operation of the old instrument include running a sample of the same batch for 10 years as quality assurance measure. The old method yielded over all these years an average value of 10.5 ppm with a standard deviation of 0.2 ppm. The new instrument has been tested for a week and the first results are shown below 10.0 ppm 10.4 ppm 10.2 ppm 10.8 ppm 10.1 ppm 10.5 ppm 10.1 ppm Using the new instrument on the first day the technicians got a value of 9.0 ppm. Are the technicians right to exclude the measurement of the first day as an outlier at the 90% confidence level? O Qx0.456, Qon0.484 Qexp5 Q.rtt.cannot reject data point with 90 % confidence. O Qe 0.654. Qcrit= 0.484 Qexp > Qott reject data point with 90 % confidence Qx 0.56, Qant 0.468 Qexp? Qott reject data point with 90 % confidence O Qexp 0.56, Qont 0.607 Qexp

Explanation / Answer

Yes, the technicians were right to exclude the measurement of the first day as an outlier at the 90% confidence level

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