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Types of Errors and Bias in Measurements

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Types of Errors and Bias in Measurements

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Questions and Answers

What type of errors are indeterminate or random errors?

Errors that do not affect precision

Errors caused by specific variables

Errors that are determined and controlled

Errors that affect precision (correct)

Which of the following is an example of a random error?

Wrong test performed due to mislabeling

Incorrect patient ID error

Contaminated samples due to poor technique

Presence of bubbles in one of the trials (correct)

What do random errors result from?

Many small, uncontrollable variables and personal judgments (correct)

Specific, predictable variables

Controlled variables

Large, controllable factors

Which of the following is NOT mentioned as a type of personal error in the medical laboratory?

Late reports Signup and view all the answers

How do random errors influence a measured value?

Decrease precision Signup and view all the answers

What is the main characteristic of systematic errors?

They have an assignable cause Signup and view all the answers

Which term is used to measure the systematic error associated with an analysis?

Bias Signup and view all the answers

What is the sign of bias if it causes the results to be low?

Negative Signup and view all the answers

What causes instrumental errors in analytical chemistry?

Nonideal instrument behavior Signup and view all the answers

Which type of error arises from the personal limitations of the experimenter?

Personal Errors Signup and view all the answers

In analytical chemistry, what can cause a weight to be less than the correct one in the gravimetric method?

Insufficient insolubility of precipitate Signup and view all the answers