Uncertainty

What is the uncertainty for the data set below?

5.2 kg

4.9 kg

5.0 kg

4.8 kg

(a)  

Does parallax affect the precision of a measurement that you make? Explain.

• Parallax does not affect precision because precision is related to how exact a device can be. However, parallax affects accuracy.

• Parallax does affect precision because it does not allow the reading to be done correctly of the measurement.

• Parallax does not affect precision because accuracy is not affected as well.

• Parallax does affect precision because accuracy is affected as well.

Select the statement that is most true.

• An error value must always be positive.

• A percentage error can be negative.

• An error value may be negative but the percentage is always positive.

• The percentage error will always be negative when the error is negative

What is the temperature and uncertainty indicated by this thermometer?

• 24.1 ± 0.5 °C

• 24.05 ± 0.05 °C

• 24 ± 1 °C

• 28.0 ± 0.1°C

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

This bullseye demonstrates...

• High Accuracy & High Precision

• High Accuracy & Low Precision

• Low Accuracy & High Precision

• Low Accuracy & Low Precision

Tags

NGSS.MS-PS3-1

Given a = 23.2 ± 0.3 m and b = 8.41 ± 0.41 m

If a + b

What is its absolute uncertainty?

• 0.7 m

• 0.71

• 0.06 m

• 0.062

Given 23.2 ± 0.3 m² What is its percentage uncertainty with 2 sig fig? (Round at the end) Just write down the number without the "%"

(a)  

Random errors lead to a lack of:

• accuracy in the measurement.

• significant digits in the measurement.

• precision in the measurement.

• gradation of the measuring instrument

What is the uncertainty in the measurement 12.5 ± 0.2 cm?

• 0.2 cm

• 0.3 cm

• 0.5 cm

• 0.7 cm

If a measurement is recorded as 15.0 ± 0.5 g, what is the percentage uncertainty?

• 3.3%

• 3.0%

• 3.5%

• 4.0%