## Difference between sampling and non sampling error

**Sampling error**

sampling gives rise to certain error known as sampling error the error could not be present in a complete enumeration survey the error can be controlled.

**Biased Errors**

**This error arise from any biased in selection estimation, etc**

For example if in place of simple random sampling deliberate sampling has been used in the particular case some wise is introduced in the Richard and hence such error are called biased sampling error.

**Unbiased error**

These error arises due to to chance difference between the member of population including in the same per and those not included. An error in statics is different between the value of static and that of corresponding parameter.

**Causes of Bias**

Bias may arise due to

Faculty process of selection

Faculty work during the collection

Faculty method of analysis.

**Faculty selection**

faculty selection of the sample main give rise to buyers in a number of ways

Deliberate selection of representatives sample

Conscious or unconscious bias in the selection of random sample.

Substitution

Non-response

Bias due to faculty collection of data

Any consistent error in measurement will give rise to buy whether the measurement are are carried out on a simple or on all the units of the population.

**Bias in Analysis**

in addition to base which arises from faculty process of selection and faculty collections of information, faculty method of analysis may also introduced by.

**Avoidance of Bias**

If possibility of bias exist fully objective conclusion cannot be drawn. The first essential of any sampling for sensors produce must therefore be the elimination of all sources of bias.

The sampling error usually decreases with increase in sample size and in fact in which situation the decreases is inversely proportional to the square root of the sample size as as can be seen. Sample survey to provide estimates within permissible margin of error instead of a complete enumeration survey as in the letter the F4 and the cost needed will be substantially higher due to the attempt to reduced sampling error to zero.

**Non sampling errors**

non sampling error can occur at every stage of planning and execution of census for survey such error can arise due to a number of causes such as defective method of data collection and tabulation faculty definition incomplete coverage of the population for sample etc.