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Resourcd File


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Resourcd File

  1. 1. Inferential Statistics – Finding the critical values You will notbe askedhowto workout the inferential tests –butyou mightbe askedto workout whetherthe testissignificantusingcritical values. Each test hasa differenttable –youdo not need tolearnthe table butyou doneedto know how to readthe tablesforeachtest. Spearman’s Rho - correlation The first inferential test we will look at is a test of correlation – Spearman’s rho. It is used to determine whether the correlation between two co-variables is significant or not. Critical values table for Spearman’s Rho Key: Directional hypothesis – one-tailed Non-directional= two tailed test N= means number of participants.
  2. 2. Chi-Square (x2) test – this deals with nominal data i.e. data that is in categories. We use this test when we have counted how many occurrences there are in each category – called ‘frequency data’. This test is done slightly differently so take note! Mann Whitney Is a test of difference’. We can look at whether two samples of data are different or not different from each other i.e. that they are drawn from the same population (the null hypothesis) or from two different populations. Tests of difference are generally used for experiments. For example we might conduct an experiment to see if noisy conditions reduce the effectiveness of revision.
  3. 3. Wilcoxon Test – This is used when pairs of data are related such as a repeated measures design. Each participant is tested twice and their scores are compared to see if there is any difference. Matched pairs is also a related design – where there are two groups of participants, but each participant in one group is matched with a participant in the other group on key variables, so in a sense it is like testing the same person twice.