In this article I would like to examine the division of voivodships into Poland A and Poland B using various clustering and dimension reduction methods. Firstly, I will attempt to cluster voivodships without reducing the number of variables taken into account. To do this, I will use hierarchical agglomerative, hierarchical divisive, k-means and k-medoids clustering. Then, I will apply dimension reduction on the dataset using principal component analysis and multidimensional scaling. Finally, I will perform clustering on the dataset with reduced number of variables.

The main goal of this article is to explore young adults’ music preferences using associations rules. In particular, the goal was to answer the following research questions: What type of young adults like listening to music? What are the associations between music genres people like to listen to? What are the associations between music genres people do not like to listen to? What personality traits make people like listening to Music and what personality traits people who like listening to music tend to have?