Precision vs Accuracy Recall

When aiming for the bullseye, the RED darts represent:

• low precision & high accuracy

• low precision & low accuracy

• high precision & high accuracy

• high precision & low accuracy

Answer explanation

The RED darts hitting the bullseye indicate both high precision (consistent grouping) and high accuracy (close to the target). Thus, the correct choice is high precision & high accuracy.

A GPS system attempts to locate a restaurant at the center of the bull’s-eye. The black dots represent each attempt to pinpoint the location of the restaurant. The GPS located this restaurant with:

• high precision & high accuracy

• high precision & low accuracy

• low precision & high accuracy

• low precision & low accuracy

Answer explanation

The GPS attempts are scattered (low precision) but consistently point to the correct location (high accuracy), indicating that while the attempts vary, they are centered around the true location of the restaurant.

The black marks on the target represent:

• high precision & high accuracy

• high precision & low accuracy

• low precision & high accuracy

• low precision & low accuracy

Answer explanation

The black marks are scattered and far from the target center, indicating low precision (inconsistency) and low accuracy (not close to the target). Thus, the correct choice is low precision & low accuracy.

When aiming for the bullseye, the BLUE darts represent:

• high precision & high accuracy

• high precision & low accuracy

• low precision & high accuracy

• low precision & low accuracy

Answer explanation

The BLUE darts are clustered closely together but not near the bullseye, indicating high precision (consistent grouping) but low accuracy (not hitting the target). Thus, they represent high precision & low accuracy.

____________ is defined as the level of correctness of a measurement to its true value.

• precision

• accuracy

Answer explanation

Accuracy refers to how close a measurement is to its true value, while precision indicates the consistency of measurements. Therefore, the correct answer is accuracy.

__________ is defined as the repetition of results or of a measurement.

• precision

• accuracy

Answer explanation

Precision refers to the consistency and repeatability of measurements, indicating how close the results are to each other. Therefore, the correct answer is precision, as it specifically relates to the repetition of results.

Measurements are accurate but not precise.

• True

• False

Answer explanation

Measurements can be accurate if they are close to the true value, but not precise if they lack consistency or repeatability. Therefore, the statement that measurements are accurate but not precise is true.

A baseball or softball pitcher would want to pitch with _______ & _______ to strike out the batter. (choose 2)

• High Accuracy

• Low Accuracy

• High Precision

• Low Precision

Answer explanation

A pitcher needs High Accuracy to consistently throw strikes and Low Precision to vary pitch locations, making it harder for the batter to predict and hit the ball, increasing the chances of a strikeout.

When Aleece measures with a ruler, she always lines up the very end of the ruler to the start of the line, not the zero. This is an example of measuring with: (choose 1)

• High Accuracy

• Low Accuracy

• High Precision

• Low Precision

Answer explanation

Aleece's method of measuring from the end of the ruler instead of the zero mark leads to consistent errors in her measurements. This results in low accuracy, as the measurements do not reflect the true length accurately.

The more measurements you make and the better the precision, the smaller the error will be.

• true

• false

Answer explanation

True. Making more measurements and improving precision reduces random errors, leading to a more accurate result. Thus, the statement is correct.