ACCURACY AND PRECISION, CHTP 4 7
STATISTICAL TREATMENT OF DATA
True value or Most probable value
True value
True value of a measurement is the value that would be obtained
by a perfect measurement
4 01
Thus true value can never be known with absolute certainty
94
Most probable value 70
56
The average of the best results obtained by efficient and
19
experienced workers in many laboratories using different
-9
techniques or those obtained by using the most highly sophisticated
Y
instruments is the most probable value generally taken as the true
H
AT
value.
EV
R
1
, Errors
The difference between the true value and the measured value of a
quantity is known as error
Error is also a mean of expressing the accuracy of a measurement.
Errors may be expressed as
Absolute error
Relative error
401
94
70
56
19
-9
Y
H
AT
EV
R
2
STATISTICAL TREATMENT OF DATA
True value or Most probable value
True value
True value of a measurement is the value that would be obtained
by a perfect measurement
4 01
Thus true value can never be known with absolute certainty
94
Most probable value 70
56
The average of the best results obtained by efficient and
19
experienced workers in many laboratories using different
-9
techniques or those obtained by using the most highly sophisticated
Y
instruments is the most probable value generally taken as the true
H
AT
value.
EV
R
1
, Errors
The difference between the true value and the measured value of a
quantity is known as error
Error is also a mean of expressing the accuracy of a measurement.
Errors may be expressed as
Absolute error
Relative error
401
94
70
56
19
-9
Y
H
AT
EV
R
2