This posts shows data cleaning and preparation for a data set on a statistics test (NHST inference). Data is published under a CC-licence, see here. Data was collected 2015 to 2017 in statistics courses at the FOM university in different places in Germany. Several colleagues helped to collect the data. Thanks a lot! Now let’s enjoy the outcome (and make it freely available to all). Raw N is 743. The test consists of 40 items which are framed as propositions; students are asked to respond with either “true” or “false” to each …