Introduction
This part of the exam assesses your competence in analyzing data and presenting results. This part has
one question, for which you need to perform a data analysis and present your findings in a short report.
The software to use for the analysis is R. You show that you are capable of writing and understanding
your own code.
Based on the results of your analysis, give an interpretation of your findings. Show the numbers which
you calculated, and explain what these mean. Give an overall answer to the question.
The grading of the question is based on:
• skill in using R
• showing that the numbers in the report are indeed calculated by R, and not obtained some other
way
• correct interpretation of findings
• clear written argument to answer the question.

Question

We consider quality control. An entertainment park checks the quality of its service offering by a
survey. Every day, they distribute their survey to a number of randomly chosen park visitors.
Based on the answers the visitors give, an overall satisfaction for each visitor is calculated. This
satisfaction is then recorded as 0 = not satisfied, 1 = satisfied.
All data collected for the past days are gathered in a data file. Your job is to analyze the data in this file.
The questions are:
• What percentage of the visitors is satisfied?
• Is this satisfaction consistent over all days you analyzed, or are there days which show a special
pattern?
• Which recommendations do you make if the park wants to improve the satisfaction?

Instructions & Submission
Each student works with her / his own data file. Consult the list in the files document to see with which
file you have to work with.
Answers are submitted in a word document. Each student submits just 1 document. At the top of the
document, clearly give your name and the file number you used.
The answer to the question is maximum 1000 words. You can / are encouraged to include (a) graph(s)
in your answer.
In an appendix, add your R code. This code is not included in the word count.
In the R code, add comments at appropriate places to explain what the code is doing.