Do Now Turn in Theophylline Clinical Trial HW Safety Quiz Today: Accuracy vs. Precision. Finish for HW

Accuracy vs. Precision

Accuracy vs. Precision Accuracy=how close the results are to the correct answer (Bull’s eye!) To determine accuracy, we look at the average of our results. Precision= how often the same results are measured/obtained To determine precision, we look at the consistency of our results.

AVERAGE ACCURATE NO

each trial/measurement precise NO

Accuracy vs. Precision Practice YES YES

Accuracy vs. Precision Practice 4.67 NO 99 YES YES NO

Percent Error A quantitative way we can look at the accuracy of a set of data if the true value is known For this class, we’ll say the data is accurate if the percent error is less than 5%

The freezing point of water is 273. 2 K, but it was measured at 250 The freezing point of water is 273.2 K, but it was measured at 250.1 K. What is the percentage error? Subtract first, then divide, then multiply by 100 23.1 273.2 ×100% 250.1−273.2 273.2 ×100%= =0.084×100% =𝟖.𝟒% NOT ACCURATE

Percent Error Practice 2) 4.49 % 3) 888% 4) 3.88%