# 2._ONEWAYANOVA_SPSS.pdf - ONE-WAY ANOVA Laerd Statistics...

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1 ONE-WAY ANOVALaerd Statistics (2017). Statistical tutorials and software guides. Introduction If you want to determine whether there are any statistically significant differences between the means of two or more independent groups, you can use a one-way analysis of variance (ANOVA). For example, you could use a one-way ANOVA to determine whether exam performance differed based on test anxiety levels amongst students (i.e., your dependent variable would be "exam performance", measured from 0-100, and your independent variable would be "test anxiety level", which has three groups: "low-stressed students", "moderately-stressed students" and "highly-stressed students"). As another example, a one-way ANOVA could be used to understand whether there is a difference in salary based on degree subject (i.e., your dependent variable would be "salary" and your independent variable would be "degree subject", which has five groups: "business studies", "psychology", "biological sciences", "engineering" and "law"). Example used in this guide A researcher believes that individuals that are more physically active are better able to cope with stress in the workplace. To test this theory, the researcher recruited 31 subjects and measured how many minutes of physical activity they performed per week and their ability to cope with workplace stress. The subjects were categorized into four groups based on the number of minutes of physical activity they performed: namely, "sedentary", "low", "moderate" and "high" physical activity groups. These groups (levels of physical activity) formed an independent variable called group. The ability to cope with workplace stress was assessed as the average score of a series of Likert items on a questionnaire, which allowed an overall "coping with workplace stress"score to be calculated; higher scores indicating a greater ability to cope with workplace-related stress. This dependent variable was called coping_stress and "ability to cope with workplace-related stress" abbreviated as "CWWS" score. The researcher would like to know if CWWS score is dependent on physical activity level. In variable terms, is mean coping_stress score different for different levels of group?
2 The Variable View in SPSS Statistics The Data View in SPSS Based on the file setup for the dependent and independent variables in the Variable Viewabove, the Data Viewwindow show look as follows: fdowopshiwnmh(moan.(tuunamesdefine
3 Basic requirements of the one-way ANOVA In order to run a one-way ANOVA, there are six assumptions that need to be considered. The first three assumptions relate to your choice of study design and the measurements you chose to make, whilst the second three assumptions relate to how your data fits the one-way ANOVA model. These assumptions are: oAssumption #1: You have one dependent variablethat is measured at the continuouslevel. Examples of continuous variablesinclude height (measured in metres and centimetres), temperature (measured in °C), salary (measured in US dollars),

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