A laboratory instructor gives a sample of powdered metal to each of four student

Question

A laboratory instructor gives a sample of powdered metal to each of four students, I, II, III, and IV, and they weigh the samples. The results of their multiple trials follow. The true value is 8.63 g.:8 71 g, 8.70 g. 8.84 g:8.56 g. 8.63 g. 8.69 g:8.79 g, 8.51 g. 8.64 g: 8.76 g. 8.53 g. 8.57 g Calculate the average mass from each set of data. Tell which set is the most accurate. Precision is a measure of the average of the deviations of each piece of data from the average value. Which set of data is the most precise? Is this set also the most accurate? Which set of data has the best combination of accuracy and precision? Which set of data has the worst combination of accuracy and precision?

Explanation / Answer

By definition;

Accuracy is how close a measured value is to the actual value.

Precision is how close the measured values are to each other.

The four set of values which after the difference from 8.63 are as follows:

Out of all, 2 set of values are more accurate to true value. Also these set of values are precise.

Out of all, set 1 values are least accurate and precision of reproducible values are lacking.

For question C:

Answer: 2

For Question D:

Answer: 1

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