The following information comes from a study that examines changes in smoking status over a two-year period. In 2018, a sample of 70 adults over the age of 18 were asked to identify themselves as smokers or non-smokers. In 2020, the same 70 individuals were again be asked whether they were currently smokers or non-smokers.   2018 2020 Non-Smokers Smokers Non-Smokers 25 10 smokers 20 15   Describe the contingency table. Which statistical test is appropriate to use on these data?