A survey asks a group of students if they buy CDs or not. It also asks if the students own a smartphone or not. These values are recorded in the contingency table below. What is the test statistic, 20, for this test for homogeneity? . Round the final answer to one decimal place (using expected frequencies that are also rounded to one decimal place). CDS No CDS Row Total Smartphone 8 17 25 No Smartphone 11 16 27 Column Total 19 33 52 Provide your answer below: chi-square test statistic=