In a contingency table of observed frequencies of two variables x and y , the Chi-squared test statistic is calculated as 6. Given that there are 2 rows and 5 columns in the contingency table, which of the following statements is TRUE? A The degrees of freedom for the test is 10 B At 95% confidence level, the critical value is 18.3070 C At 95% confidence level, the test shows that there is no association between the two variables D At 95% confidence level, the test shows that there is an association between the two variables