Interval frequency distributions used as a secondary data do not provide full information about the distribution of the variable of interest. In order to estimate quantiles, it is common to use one of interpolation ...

The author begins by mentioning his lectures on statistical methods he has given in Poland and abroad during the last fifty years, focusing on lectures and exercises in mathematical statistics and statistical inference ...

E-learning tools are an attractive and powerful new way in teaching statistics. There is a huge variety of web-based statistics resources available. The web-based systems contents combine text information, multimedia ...

The purpose of this paper is a brief discussion of some recent ideas, that could be useful for more intuitive and more modern teaching of calculus (i.e. mathematical analysis). I limited myself to the fundamental concepts ...

Among methods of time series analysis present in statistical packages, most of them are smoothing methods. Although they are efficient in many cases, especially in forecasting, they are unable of describing a model of ...

The article focuses on organization of a direct interview with a survey questionnaire to conduct research into quality of services provided by the HELIOS Film Centre in Radom. The factors which may influence customer ...

One of the main descriptive characteristics is the mode. For continuous variables it is not always easy to properly determine the mode. There are some estimates of the mode provided in literature, however, unlike the ...

The article shows the test of the answer to two questions: 1) the motivation of the externally students to begin economic studies, 2) the estimate o f quantitative methods usefulness in the professional work (current and ...

The paper considers the usefulness of interpretation of the demographic events and facts at the regional, national and global level. The author INDICATES that wide observation of population processes (in territorial ...