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Chapter 1 Measurements

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Accuracy and Precision

Timberlake LecturePLUS

How close a measurement is to the actual or true value

good accuracy

true value

poor accuracy

true value

Timberlake LecturePLUS

How well several measurements agree with each other

good precision

poor precision

Timberlake LecturePLUS

What can you say about the accuracy and precision in each of the following:

Good precision, poor accuracy

Good precision, good accuracy

Timberlake LecturePLUS

In your new job, you are to make the pizzas the size shown above. Your first four pizzas are shown below.

What can you say about the accuracy and precision of your pizzas?

Timberlake LecturePLUS

What can you say about the accuracy and precision of the next four pizzas?

Timberlake LecturePLUS

The two pizzas in the center show good accuracy. However, the precision is poor.

Timberlake LecturePLUS

You have very good precision, but poor accuracy. I think the customers will want the pizzas made larger.

Timberlake LecturePLUS

Match the following terms

1) Accuracy2) Precision

___ How close a measurement is to the

true value.

___ How close several measurements

are to each other.

Can you have data that are precise, but not accurate? Why or why not?

Timberlake LecturePLUS

Match the following terms

1) Accuracy2) Precision

_1_ Is how close a measurement is to the

true value.

_2_ Is how close several measurements

are to each other.

Yes. Data can be precise, but not come close to the true value.

Timberlake LecturePLUS

How will each of the following affect accuracy and precision?

1. A meter stick that is missing the first centimeter.

2. A scale that has a zero point that is really five pounds above zero.

Timberlake LecturePLUS

How will each of the following affect accuracy and precision?

1. The shortened meter stick will produce measurements that have poor accuracy, but good precision is possible.

2. The poorly calibrated scale will give a weight that is not accurate, but good precision is possible.

Timberlake LecturePLUS

True(1) or false (2). Measurements can have

poor accuracy and poor precision

good accuracy and poor precision

poor accuracy and good precision

good accuracy and good precision

Timberlake LecturePLUS

True(1) or false (2). Measurements can have

poor accuracy and poor precision

good accuracy and poor precision

poor accuracy and good precision

good accuracy and good precision

1

2

1

1

Timberlake LecturePLUS