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# Smokers to suffer from more chest infections than the non-smokers - Essay Example

## Extract of sample Smokers to suffer from more chest infections than the non-smokers

The relevant test based on data type of dependent and independent variable is CHI SQUARE GOODNESS OF FIT TEST.
The basic idea behind the chi-square goodness of fit test is to divide the range of the data into a number of intervals. Then the number of points that fall into each interval is compared to expected number of points for that interval if the data in fact come from the hypothesized distribution. More formally, the chi-square goodness of fit test statistic can be defined as follows.
Here again the data type of both independent variable and dependent variable is discontinuous and categorical. The relevant test based on data type of dependent and independent variable is CHI SQUARE Contingency tables. There are ten different groups based on the mood condition i.e. depressed to elated captured in 10 different categories. The Hypothesis tests may be performed on contingency tables in order to decide whether or not effects are present. Effects in a contingency table are defined as relationships between the row and column variables; that is, are the levels of the row variable differentially distributed over levels of the column.
Frequency tables of two variables presented simultaneously are called contingency tables. ...Show more

## Summary

Choosing the right statistical test depends on important factors viz. nature of the data, Sample characteristics and Inferences to be made. The nature of data means number of variables and type of data i.e. numerical or continuous, dichotomous or categorical information and rank-order or ordinal…
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