Country : Australia
Assignment Task:

Task:

This assignment will be marked out of 30. It is worth 30% of the final mark in this subject.  Your assignment should not exceed 5 pages (the page limit does not include appendix).  Please submit a copy of your assignment via Moodle/Turnitin by the due date. 
Background 
A study of the learning effects of repeated trials of a video game by players of different ages is conducted. Twenty eight players ranging in age from 23 to 48 years each played the video game 5 times (one day apart) with their score recorded each time. It is thought that age has an impact on learning of the game. 

  •  INITIALS – initials of the player; 
  •  PLAYER_ID – ID number of the player; 
  •  AGE – age in years of the player; 
  •  TRIAL – the time (or day) which the game was played (1- 5); 
  •  SCORE – the score on the video game (in thousands of points); 

The researcher is interested in carrying out an analysis to understand how the variables AGE and TRIAL influence the variable SCORE. It can be assumed that TRIAL is measuring time in days as each trial is separated by one day and that each player recruited has not had any experience with this particular game. 
The data file VideoGameData.csv has 140 rows and 5 columns and is provided on Moodle. The variable called AGEGROUP has been created from the variable AGE and has three categories: 20-29; 30-39; and 40-49; using values 1, 2 and 3 respectively.  No statistical approach is able to give us the “ground-truth” so we will gather converging evidence from various approaches and packages in order to generate robust conclusions. 
 

Questions 
(a) Make an appropriate graphical representation that shows the data distribution and/or dispersion, as well as the influence of AGE (you can also use AGEGROUP) and TRIAL (and their interaction) on Score (3 marks). 
- What effects this representation suggests at a descriptive level? (3 marks) 
(b) Run a linear-mixed model to check if AGE and TRIAL (and their interaction) have a significant effect on Score. Specify random intercepts for the participants. 
- Specify the model that you used (2 marks). 2

 

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  • Uploaded By : Pearl
  • Posted on : May 04th, 2019
  • Downloads : 134

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