Accuracy and Precision Flashcards
Which set of measurements best represents accuracy if the true value is 6.80 kg?
a
6.80 kg, 6.70 kg and 6.90 kg
b
6.75 kg, 6.80 kg and 6.85 kg
c
5.80 kg, 6.80 kg and 7.80 kg
d
6.10 kg, 5.99 kg and 6.11 kg
The actual temperature of a refrigerator is 37 deg F. The tested temperature in deg F is 39.1, 39.2, 39.2, and 39.2 respectively. This distribution shows:
high precision
A measurement has high _____ when it is very close to the true value.
accuracy
Three players (A, B and C) shoot three arrows at a target respectively and the results are shown above. If you are their coach and will appoint a player to participate in an important game, which one will you choose according to their precision and accuracy?
Player B
A chemistry student is experimentally determining the boiling point of bromine. The experimental melting points are listed below from a to e. Which one should he discard so that he can say his data is precise?
56.3 °C
Precision is:
The degree to which repeated measurements under unchanged conditions show the same results
A student took seven trials to measure the experimental boiling point value of water at standard atmospheric pressure. The experimental results are listed below
How many trials should be discarded so that he can say their data is precise?
2
Water has an accepted boiling point of 100°C ± 0.4 at standard atmospheric pressure. A student took ten trials to measure the experimental boiling point value. The experimental results are listed below
How many values of these trials can be considered accurate?
5
Wendy is using a poorly calibrated electronic balance to measure the mass of a crucible. Her technique in making the measurement is very careful and she repeats it three times. What will likely characterize her measurements?
Low accuracy and high precision
____ is a measure of how close a series of measurements are to one another.
Precision
A valid measurement can either be accurate or precise.
false
An organic chemistry student is experimentally determining the melting point of fluorenone. The experimental melting points are listed below from a to e. Which one should he discard so that he can say his data is precise?
85.6 °C
The actual temperature of a room is 40 degrees Celsius. The tested temperature in degrees Celsius is 37.1, 37.2, 37.3, and 37.5 respectively. This distribution shows:
high precision
The same or similar results in successive measurements is a feature of which measure?
Precision
Which set of measurements represents the greatest precision?
6.83 kg, 6.80 kg and 6.85 kg
Accuracy reflects how close the measured value is to the:
actual value
____ is a measure of how close a measurement is to the correct or accepted value of the quantity being measured.
accuracy
True or False:
Accuracy is the degree to which repeated measurements under unchanged conditions show the same results.
false
Good precision always give good accuracy.
false
Accuracy is qualitative.
false
Precision refers to how close the values in a set of measurements are to one another.
true
The smaller the difference between the mean experimental value and the true value, the larger the accuracy.
true
Precise measurements are highly reproducible, even if the measurements are not near the correct value.
true
The term “accuracy” denotes the closeness of an experimental value or the mean value of a set of measurements to the true value
true
If the average value of different measurements is near to the correct value, it is said to be accurate
true
A student measures the volume of acid three times and the reading come out to be 27.25 ml, 27.38 ml, and 27.42 ml respectively. But the actual volume of acid is 27.34 ml. Hence the measurements taken by the student are precise as well as accurate.
true
