Question

question 15 of 25 a scientist collected data using four different instruments. she organized her results in a table, with the measurements from each instrument in a separate column. the actual value is 10.9. which column shows low precision and high accuracy? 1 2 3 4 10.8 9.8 17.8 6.4 11.4 12.4 8.2 5.8 11.2 11.2 8.6 6.2 11.4 10.4 18.4 6.2 11.2 10.6 6.6 5.6 a. 3 b. 4 c. 2 d. 1

Explanation:

Step1: Recall precision and accuracy concepts

Precision is about how close measurements are to each other. Accuracy is about how close measurements are to the true - value.

Step2: Analyze Column 1

Values in Column 1 are 10.8, 11.4, 11.2, 11.4, 11.2. They are close to each other (high precision) and close to 10.9 (high accuracy).

Step3: Analyze Column 2

Values in Column 2 are 9.8, 12.4, 11.2, 10.4, 10.6. They are somewhat spread out (low precision) but on average close to 10.9 (high accuracy).

Step4: Analyze Column 3

Values in Column 3 are 17.8, 8.2, 8.6, 18.4, 6.6. They are very spread out (low precision) and far from 10.9 (low accuracy).

Step5: Analyze Column 4

Values in Column 4 are 6.4, 5.8, 6.2, 6.2, 5.6. They are close to each other (high precision) but far from 10.9 (low accuracy).

Answer:

C. 2