Accuracy And Precision

Question 1

Prime consideration in every measurement made

Answer 1

Accuracy and precision

Question 2

Unavoidable in measurement due to several factors

Answer 2

Errors

Question 3

Factors why error occurs

Answer 3

1. The kind of measuring device use
2. Methods in getting the measurements
3. Condition under which measurement is made

Question 4

Types of error

Answer 4

1. Random error (unsystematic error)
2. Systematic error

Question 5

Error that has no pattern, inconsistent

Answer 5

Random error

Question 6

Error that is consistent and repeatable due to the kind of measuring devices used. It is also due to flawed experimental design

Answer 6

Systematic error

Question 7

Closeness or nearness of measurement to the accepted value. Express in terms of absolute error or percentage of error

Answer 7

Accuracy

Question 8

Describes how closely measurements are to each other and how carefully measurements were made Agreement of several measurements made in the same way. Express in terms of deviation or percentage of deviation

Answer 8

Precision

Question 9

Accuracy formula

Answer 9

AE= |O-A|

Where:
AE- absolute error
O- observed value
A- accepted value

Question 10

Precision formula

Answer 10

AD= |O-M|

Where:
AD= absolute deviation
O- observed value
M- mean of several measurements

Question 11

How to get percentage of error and accuracy

Answer 11

% of error= AE/A × 100%

% or accuracy= 100%- % or error

Question 12

How to get percentage of deviation and precision

Answer 12

% of deviation = AD (ave)/ M × 100%

% of precision = 100% - % of deviation