Mention 3 common types of error and state how to minimize each type
Answers
: The measurement error is defined as the difference between the true or actual value and the measured value. The true value is the average of the infinite number of measurements, and the measured value is the precise value.
The error may arise from the different source and are usually classified into the following types.
These types are -
These types are -Gross Errors
These types are -Gross ErrorsSystematic Errors
These types are -Gross ErrorsSystematic Errors Random Errors
These types are -Gross ErrorsSystematic Errors Random ErrorsGross Errors
The gross error occurs because of the human mistakes.
For examples consider the person using the instruments takes the wrong reading, or they can record the incorrect data. Such type of error comes under the gross error. The gross error can only be avoided by taking the reading carefully.
Systematic Errors
The systematic errors are mainly classified into three categories.
Instrumental Errors
Instrumental ErrorsEnvironmental Errors
Instrumental ErrorsEnvironmental ErrorsObservational Errors
Random errors:- the error which is caused by the sudden change in the atmospheric condition, such type of error is called random error. these type of error remain even after the removal of the systematic error. hence such type of error is called as random errors.
Minimising errors:
These errors can be minimised by using proper instruments, improving the experimental procedure and removing personal biasr
How to minimize measurement error
Once you understand the main forms of experimental error, you can act on preventing them. The following precautions will help you reduce measurement error and yield the most accurate results.
Use quality equipment
Using quality equipment is paramount to reducing systematic measurement error. Make sure you’re using an updated and precise measuring device that doesn’t have any defects while conducting your experiment.
Calibrate your equipment properly
Before conducting an experiment, make sure to properly calibrate your measurement instruments to avoid inaccurate results.
Properly train lab staff
The imperfect nature of humans means there will always be human error when they observe and measure results. Minimize this impact by taking the time to train all applicable lab staff on how to properly use all equipment and carry out procedures when conducting an experiment.
Controlled environment
All measurements in an experiment should occur under controlled conditions to prevent systematic error. Changes in external conditions such as humidity, pressure, and temperature can all skew data, and you should avoid them.
Double-check
To reduce the impact of human error, personnel need to double-check all observations, recordings, and measurements. You can easily complete this process by double-entering all findings on two separate worksheets or files and then comparing them.
As previously stated, one of the best ways to reduce measurement error is by using quality equipment. If your current lab equipment is old or worn, it might be time for an upgrade. At USA Lab Equipment, we stock over 1,000 quality lab equipment items—from ultra-low upright freezers to filtration devices—to give you the results you need. For more information regarding our products and services, contact us today.
Explanation:
There are 3 types of error-
1. Absolute Error
2. Relative Error
3. Percentage Error
1. Absolute Error :
The difference between the true value and observed value.
i.e. , Absolute Error = True value - Observed value
2. Relative Error :
The ratio between absolute error to the true value.
i.e. , Relative Error = Absolute error / true value.
3. Percentage Error:
When the relative error expressed in percentage.
i.e. , Percentage Error = Relative error × 100%
= (Absolute error / True value) × 100%
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