Assignment Task :

You will have seen from Part 1 how the marking criteria are structured to assess each part of a task. While the criteria for this assignment will be necessarily different, again, in this Part 2 assignment, it assesses your ability to use SPSS to correctly generate descriptive and inferential analysis output, as well as the interpretation of this output. The marking criteria used will be based on your ability to: 

• Generate the correct output, based on the instructions provided 

• Interpret and communicate your understanding of the output 

• Relate your findings back to the research question or background of the data given 

A greater emphasis and higher standard will be expected with regards to the organisation and presentation of your results, so you should therefore endeavour to make your submissions clear, concise, grammatically correct, and easy to navigate for any reader of your assignment. Expectations such as following instructions, providing output in required format and using correct statistical terminology will be upheld, and penalties enacted more strictly in this assignment. 

Your mark will be available via My Marks, and an announcement will be made when this is available. Every endeavour will be made to provide results and/or feedback for this assignment prior to the provision of the Part 3 assignment. 

Feedback will be provided, though this may be addressed to the whole cohort rather than on an individual basis. 

 

Task 1 – Independent t-tests (Thinking About the Research Question) 

Answer these questions succinctly (use the following numbering in your submission; you must not re-write the question): 

1. What is the independent variable (IV)? What type of variable (quantitative or qualitative) is the IV? If it is qualitative, state the number of levels (categories) in the variable, according to your analysis. 

2. What is the dependent variable (DV)? What type of variable (quantitative or qualitative) is the DV? If it is qualitative, state the number of levels (categories) in the variable, according to your analysis. 

3. Briefly explain (in 1-4 sentences) why an ITT is the most appropriate analysis for this research question. (hint: think about the variables; you could also compare/contrast why other tests may not be suitable) 

4. What is the null hypothesis for this research question? Write this in words only (statistical notation not necessary). 

 

Task 2 – Independent t-tests (Visualising the Data) 

Generate an error bar plot of the confidence intervals of the mean of BMI in each category of location. Insert this graph into your assignment submission. 

Briefly describe (in 1-4 sentences) what this graph shows, with specific mention of: 

• What the middle point of the confidence intervals demonstrates about the groups (i.e. what statistic does this middle point represent? Compare this between the two groups). 

• What the overlap or lack thereof between the intervals suggest about statistical significance (can you use this graph to make an inference or suggestion about statistical significance? Interpret the graph accordingly) 

• What the difference/similarity in width between the two groups indicates (if the widths are similar, what does that indicate? If they’re different, why?) 

  

Task 3 - Independent t-tests (Hypothesis Test) 

Perform an ITT to evaluate this research question. Assume the assumption of normality has been met and use the built-in test of homogeneity of variance to test this latter assumption (i.e. do not generate this using the Explore function). 

For this task, you must insert your Group Statistics and Independent Samples Test output tables into your assignment document (remember to paste as an image). 

You should comment on the Group Statistics table, perhaps relating the values shown here to previous output. 

 

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  • Uploaded By : Mia
  • Posted on : July 06th, 2019

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