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Kozak, Marcin; Wnuk, Agnieszka – Teaching Statistics: An International Journal for Teachers, 2014
The Tukey mean-difference plot, also called the Bland-Altman plot, is a recognized graphical tool in the exploration of biometrical data. We show that this technique deserves a place on an introductory statistics course by encouraging students to think about the kind of graph they wish to create, rather than just creating the default graph for the…
Descriptors: Statistics, Graphs, Introductory Courses, Mathematics Instruction
Kozak, Marcin – Teaching Statistics: An International Journal for Teachers, 2011
This article addresses an important problem of graphing quantitative data: should one include zero on the scale showing magnitude? Based on a real time series example, the problem is discussed and some recommendations are proposed.
Descriptors: Graphs, Data, Statistics, Mathematical Concepts
Kozak, Marcin – Teaching Statistics: An International Journal for Teachers, 2010
Asterisks should not be used to indicate if the result of a hypothesis test is significant.
Descriptors: Hypothesis Testing, Statistics, Mathematical Concepts, Mathematics Instruction
Kozak, Marcin – Teaching Statistics: An International Journal for Teachers, 2009
This article suggests how to explain a problem of small sample size when considering correlation between two Normal variables. Two techniques are shown: one based on graphs and the other on simulation. (Contains 3 figures and 1 table.)
Descriptors: Sample Size, Correlation, Predictor Variables, Simulation
Kozak, Marcin – Teaching Statistics: An International Journal for Teachers, 2009
Interpretation of correlation is often based on rules of thumb in which some boundary values are given to help decide whether correlation is non-important, weak, strong or very strong. This article shows that such rules of thumb may do more harm than good, and instead of supporting interpretation of correlation--which is their aim--they teach a…
Descriptors: Correlation, Misconceptions, Statistics, Mathematical Concepts