A Step by Step Guide for SPSS and Exercise Studies

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Statistical tests 163 Figure 49 Owing to the fact that the data do not meet the assumptions of the parametric t test, you decide to use the equivalent nonparametric 2 Related Samples test. SPSS will convert automatically the raw data into ranks. Select the pretest and posttest variables and move them into the Test pair(s) list box. The Wilcoxon test is the most commonly employed test for 2 related samples. Use Options to ask for descriptive statistics and specify how to handle missing values. Finally, click OK (Dialog box 104). As can be seen in Table 68, there are seven negative ranks. In this example, the negative ranks indicate that the participants made more errors in the first condition, that is, before using mental practice. The positive rank indicates that one participant made more errors after using mental practice. Finally, for two participants the number of errors did not change across the two conditions (i.e., there were 2 ties). The Wilcoxon test has a value of z ˆ 2.126, which is significant (significance or p ˆ .033 (Table 69)). Therefore, you should conclude that mental practice reduced the number of errors in the complex motor skill, because the mean ranks of the two conditions differed significantly from each other.
164 Statistical tests Dialog box 104 Table 68 How to report the test When you present the results of a Wilcoxon test you should report the mean rank of each condition (before and after mental practice), the z value and its significance level. Example 12 shows how you could report the results of a Wilcoxon test in a table. Example 12: Number of errors in a complex motor skill before and after mental practice M rank z Before mental practice 4.64 2.12* After mental practice 3.50 * p
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A Step-by-Step Guide to SPSS for Sp
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First published 2001 by Routledge 1
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Contents Preface Acknowledgements x
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Contents 4 Chart and table options
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Preface This book intends to fill i
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Acknowledgements The comments and s
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2 Introduction variety of options a
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4 Introduction Data Entry Each row
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6 Introduction Dialog box 3 Dialog
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8 Data handling Dialog box 5 Dialog
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10 Data handling Dialog box 8 Dialo
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12 Data handling Dialog box 11 Dial
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14 Data handling Dialog box 14 Tabl
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26 Data handling Merge File (Add Ca
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28 Data handling Dialog box 25 Tabl
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3 Statistical tests Analyze A varie
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46 Statistical tests Table 5 Dialog
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50 Statistical tests Table 7 Dialog
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60 Statistical tests Custom Tables/
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5 Miscellaneous options Utilities V
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250 Suggested reading Pedhazur, E.
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252 Index discriminant analysis 2,
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A Step by Step Guide for SPSS and Exercise Studies

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