Which Statistical Test to Select?

Choosing a statistical test Instructions You will need to click the mouse to progress through this presentation You will need a pen and a piece of paper When asked a question write your answers on the piece of paper then click for the answer

Which test Allow your self time to study the criteria for the choice of statistic test on the next page. After this, you will have a series of tests.

Test of difference or correlation Spearman’s Rho Mann-Whitney U testWilcoxon T Chi Square At ordinal level Nominal or at least ordinal level data? Independent groups design Repeated measures/matched pairs or independent groups design?

Test of difference or correlation Wilcoxon T Nominal or at least ordinal level data? Repeated measures/matched pairs or independent groups design? What test should be used?

Test of difference or correlation Chi Square Nominal or at least ordinal level data? Independent groups design What test should be used?

Test of difference or correlation Spearman’s Rho At ordinal level Please note that there is no experimental design with correlational research Spearman’s Rho is sometimes referred to as Spearman’s rank correlation coefficient What test should be used?

Test of difference or correlation Nominal or at least ordinal level data? Repeated measures/matched pairs or independent groups design? Mann-Whitney U test What test should be used?

Now you need to justify each test Fill in the gaps The Spearman’s Rho was used because the data can be treated as at least 1)_______________ and the researches were studying a possible 2)_________________ between two co-variables 1 = Ordinal 2 = Correlation (or relationship)

Now you need to justify each test Fill in the gaps The Chi-Square test was used because the data can be treated as 1)_______________ and the researches had hypothesized that there will be 2)___________________ between conditions when using the 3) _________________________ design. 1 = Nominal 2 = a difference 3 = Independent groups (please note that the Chi-square is also used as a test of association)

Now you need to justify each test Fill in the gaps The Wilcoxon T test was used because the data can be treated as 1)_______________ and the researches had hypothesized that there will be 2)___________________ between conditions when using the 3) _________________________ design. 1 = ordinal 2 = a difference 3 = Repeated Measures (please note that the Wilcoxon T is also used for a matched-pairs design)

Now you need to justify each test Fill in the gaps The Mann-Whitney U test was used because the data can be treated as 1)_______________ and the researches had hypothesized that there will be 2)___________________ between conditions when using the 3) _________________________ design. 1 = ordinal 2 = a difference 3 = independent groups

And Finally… Fill in the table (answers on next slide) Name of testDifference or correlationLevel of measurementExperimental design Chi-Square Wilcoxon Mann-Whitney Spearman’s N/A

And Finally… Answers Name of testDifference or correlationLevel of measurementExperimental design Chi-Square Difference (or association) Nominal (presented in a 2x2 contingency table) Independent groups Wilcoxon Difference At least Ordinal Repeated Measures (or matched Pairs) Mann-Whitney DifferenceAt least Ordinal Independent groups Spearman’s Correlation At least OrdinalN/A