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15 Questions

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Precision and Accuracy: Important Terms

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Questions and Answers

What is the main reason for analyzing replicates in a set of measurements?

To determine the exact central value

To obtain different results

To save time and resources

To improve reliability and understand result variability (correct)

Which term is used to refer to the middle result when replicate data are arranged in increasing or decreasing order?

Mean

Mode

Average

Median (correct)

How is the mean calculated in a set of replicate measurements?

Choosing the highest value

By selecting the lowest value

Dividing the sum of measurements by their total number (correct)

Finding the middle value

Why is the median considered a useful measure of central tendency?

It is resistant to extreme values in a dataset Signup and view all the answers

What is one benefit of estimating uncertainty associated with the central value?

To understand the precision of the central value Signup and view all the answers

Which term refers to the average value of the middle pair when dealing with an even number of results?

Mean Signup and view all the answers

What does precision describe in terms of measurements?

The agreement among several results obtained in the same way Signup and view all the answers

How is accuracy defined in the context of measurements?

The agreement between a result and the accepted value Signup and view all the answers

What type of error causes data to be scattered around a mean value?

Random error Signup and view all the answers

What is the main characteristic of gross errors in experimental data?

They cause results to be either high or low Signup and view all the answers

What is the primary source of instrumental errors in chemical analyses?

Potential inaccuracies in measuring devices Signup and view all the answers

Which type of error may occur due to the slowness or incompleteness of reactions?

Systematic method error Signup and view all the answers

What distinguishes constant errors from proportional errors?

Constant errors are independent of the quantity measured Signup and view all the answers

Why might high results for the percentage of copper be observed in an analysis involving potassium iodide?

Caused by the presence of interfering contaminants Signup and view all the answers

What is one potential limitation when determining accuracy in measurements?

"The true value is usually unknown." Signup and view all the answers