Which of the following is a top-down approach to hierarchical clustering? mapua student body-> school/department -> program ->year level student number > section> course code > school/department organization membership > school/department > campus > university/college/institute . surname> birth month > birth year > generation The following constitutes data cleaning, except... O removing null values graphing the data reducing dimensionality converting nominal data to numerical data It describes the range within which the population mean is expected to be under a certain probability significance level O population mean confidence limit O confidence interval describes how spread out the sample data is median O variance mean standard deviation Partitional clustering includes multiple levels of clusters and subclusters O False True