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Test Yourself

Question 1.

Assume the middle of the dart board in the figure below represents the true population parameter we are trying to estimate, and each of the marks a point estimate.

Bias (accuracy) and Precision

Select the statement below which summarises the characteristics of the point estimates in each target

Dart Board #1 is

Dart Board #2 is

Dart Board #3 is

Dart Board #4 is

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True or False

Question 2.

The true concentration of a steroid in maternal blood is 50nmol/L. Three methods of measurement are used which give the following results in triplicate:

Method A: 75, 73, 77 nmol/L

Method B: 42, 59, 47 nmol/L

Method C: 120, 112, 99 nmol/L

 

Question 1

Method A is the most precise.

Question 2

Method A is the most accurate.

Question 3

Method B is the most precise.

Question 4

Method B is not as precise as A but is more accurate.