accuracy and precision

(a)   is a measure of how close measurements come to each other when they are made in the same way.

Answer explanation

Precision refers to the closeness of repeated measurements to each other. It indicates the consistency of results when measurements are taken in the same manner, making it the correct choice for the blank.

• Student A

• Student B

• Student C

• Cannot be determined

How close a measurement is to the accepted value is called (a)   .

Answer explanation

How close a measurement is to the accepted value is referred to as 'Accuracy'. This term specifically denotes the degree of closeness to the true value, distinguishing it from other concepts like precision.

This bullseye demonstrates...

• High Accuracy & High Precision

• High Accuracy & Low Precision

• Low Accuracy & High Precision

• Low Accuracy & Low Precision

Answer explanation

This bullseye shows points clustered closely together but far from the target center, indicating high precision (consistent results) but low accuracy (not hitting the target). Thus, the correct choice is Low Accuracy & High Precision.

This bullseye demonstrates...

• High Accuracy & High Precision

• High Accuracy & Low Precision

• Low Accuracy & High Precision

• Low Accuracy & Low Precision

Answer explanation

This bullseye shows all shots clustered closely together and centered, indicating that the results are both accurate (close to the target) and precise (consistently grouped). Thus, it demonstrates High Accuracy & High Precision.

Which is the more precise measurement?

• 4 mL

• 4.3 mL

• 4.30 mL

• 4.300 mL

Answer explanation

The measurement 4.300 mL is more precise because it includes an additional decimal place compared to 4.3 mL and 4.30 mL, indicating a more exact value. Thus, 4.300 mL provides the highest level of precision.

Describe the accuracy and precision of the image

• Very accurate and somewhat precise

• Very accurate but not precise at all

• Not accurate at all but very precise

• not accurate and not very precise

Answer explanation

The correct choice is 'not accurate and not very precise' because the image fails to represent the intended information correctly and lacks consistency in its details.

A set of data are all close in value to each other, but they are not close to the actual value. This set of data can be described as _________________.

• precise

• accurate

Answer explanation

The data set is described as precise because the values are close to each other, indicating consistency. However, they are not accurate since they do not reflect the actual value. Thus, the correct choice is 'precise'.

Independent variable is/are

• The one variable that is changed.

• What is being measured.

• Variables that are kept the same.

• The two or more variables that are changed.

Answer explanation

The independent variable is the one variable that is changed in an experiment to observe its effect on the dependent variable. This distinguishes it from what is being measured or kept constant.

Tags

NGSS.MS-PS2-2

Dependent variable is/are

• The 1 variable that is changed.

• The variable that is measured.

• The variable that is kept the same.

• The two or more variables that are changed

Answer explanation

The dependent variable is the one that is measured in an experiment to assess the effect of changes in the independent variable. Therefore, the correct choice is 'The variable that is measured.'

Tags

NGSS.MS-PS2-2