8 A high school track coach has just purchased a new stopwatch. The stopwatch un

Question

8 A high school track coach has just purchased a new stopwatch. The stopwatch uncertainty of ±0.05 s. Runners on the track coach's team regularly clock 100-m sprints of 11.49 s to 15.01 s. At the chool's last track meet, the first-place sprinter came in at 12.04 s and the the coach's new stopwatch be helpful in timing the sprint team2,Why or why not! manual states the stopwatch has an second-place sprinter came in at 12.07 s. wi 9. Suppose you are a quality control chemist t at a pharmaceutical company is tasked with checking the accuracy and bottles. You proceed to use each machine toil ive bottles and then carefully determine the actual volume dispensed. obtaining the results tabulated in Table 3, Table 3The volumes in mL of medicine as dispensed from 3 rhachines (dispensers). Volume (mL) of Cough Medicine Delivered by 10-oz (296 mL) Dispensers Dispenser #2: 298.3 2942 296.0 978 Dispenser #3 296.I 295.9 296.1 296.0 296.1 Dispenser #1 283.3 284.I 283.9 284.0 284.1 293.9 Which dispenser provides you with precise results Which dispenser provides you with accurate results? Which dispenser provides you with both accurate and precise results? Which dispenser do you recommend to utilize in the future for the health and safety of your patients?

Explanation / Answer

Accuracy is the closeness of the measured value to the true value. Precision is a measure of consistency in the results. It is a measure of how reproducible measurements are, even though it is far away from the true value.

Dispenser 3 is most precise as all the observations are in the range of 295.9 to 296.1. dispenser 1 is also somewhat precise but lesser than dispenser 3.

Dispenser 3 is most accurate as it correctly measures 296.0 which is the true value.

Dispenser 3 is both accurate and precise.

Dispenser 3 is preferred.

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