Why should a researcher do a normality, Marketing Research

Assignment Help:

Why should a researcher do a normality and outliers' assessment before hypotheses testing?

Answer

To conduct many advance statistical techniques, researchers have to presume that data provided is normal (means it's symmetrical on a bell curve) and free of outliers. In general terms, if data was plotted on a bell curve, highest number of data points would be available in the middle and the data points would reduce on either side in a proportional fashion as we move away from the middle. Normality and outliers analysis offers clarity with regard to fundamental assumption of many advance statistical techniques. Skewness and kurtosis analysis can provide some idea with regard to normality. Positive skewness values suggest clustering of data points on the low values (left hand side of the bell curve) and negative skewness values suggest clustering of datapoints on high values (right hand side of bell curve).

Positive kurtosis values suggest that datapoints have peaked (gathered in centre) with long thin tails. Kurtosis values below 0 suggest that distribution of datapoints is comparatively flat (i.e. too many cases in extreme). In a way, without normality and outlier's assessment researcher may get false results which might result in wrong conclusion and decision making.

 


Related Discussions:- Why should a researcher do a normality

Strike perils, Strike Perils : In marine insurance, strike perils mean eve...

Strike Perils : In marine insurance, strike perils mean events which lead to loss or damage to cargo caused by: i) Strikes, lock-out workmen or persons taking part in labour di

Illustrate sociological model of consumer behaviour, Q. Illustrate Sociolog...

Q. Illustrate Sociological model of consumer behaviour? Sociological model: As-per to this model the individual buyer is a part of the institution called society. Ever since

What is convergent validity, What is Convergent validity Convergent val...

What is Convergent validity Convergent validity is the extent to which scale correlates positively with other measures of same construct. It isn't essential that all these meas

Illustrate feedback stage in organisational buying, Q. Illustrate feedback ...

Q. Illustrate feedback stage in organisational buying? The feedback stage: This stage is anxious with the establishment of order routine performance feedback and so on and henc

Show the market research for various new products, Q. Show the market resea...

Q. Show the market research for various new products? • recognize the various products available in the market, • assess the consumer demand, • identify the ingredient

Central excise formalities, CENTRAL EXCISE FORMALITIES : It is a common pr...

CENTRAL EXCISE FORMALITIES : It is a common practice all over the world that the exports are not to bear the burden of indirect taxes. Export goods are either exempted from such t

Exclusion clauses, Exclusion Clauses : Notwithstanding the vast range of p...

Exclusion Clauses : Notwithstanding the vast range of perils covered under the contract of cargo insurance, insurance cover is not provided against a number of perils and losses.

Selecting the research problem, The research problem undertaken for study m...

The research problem undertaken for study must be carefully selected. The task is a difficult one although it may not appear to be so. Help may be taken from as research guide in t

Explain engel-kollat-blackwell model, Explain Engel-Kollat-Blackwell Model ...

Explain Engel-Kollat-Blackwell Model Variables grouped into following categories a) Stimulus inputs b) Information processing c) Decision process and d) Variables

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd