Question 15 1 pts A quality control lab has just purchased a new analytical inst

Question

Question 15 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 An experienced technician that ran the old instrument stated that the mean found on the new instrument is significantly lower than the old mean. Determine if the new mean value for the data is significantly lower than the old mean at a 99% confidence interval 2xp 1.89 tet 3.707 tex, tcrt, therefore retain null hypothesis: results cannot be considered different at 99% confidence interval. O texp 2.89, t(a, V) 3.707 exp ent, therefore keep null hypothesis. results can not be considered different at 99% confidence interval exp 1.89, tert 1.85 exp? tcrt, therefore reject null hypothesis. results cannot be considered different at 99% confidence interval. txp 1.89,ertt3.143 texp tcrt , therefore keep null hypothesis: results can not be considered different at 99% confidence interval

Explanation / Answer

Question 15)

Answer: option D

Reason: the texp is equal to 1.89, and, because we are saying that the results are lower to the previous one, we use an one tail test, in that case, the Tcrit is 3.143

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