The sample data below shows the method of payment and the amount of purchase from a random sample of 200 purchases at a department store. The results are summarized in the following contingency table. 3. Assuming a Chi-square test is performed, calculate the expected frequency of the cell \"Under $30" and "Credit card". [1 Mark] b. interpret this value in the context of the question. [1 Mark] c. Suppose a chi-square test was done and the value of x2 was 53.86. Can it be concluded that there is an association between the method of payment and the ' _ amount of the purchase? Show all steps of a hypothesis test and use an appropriate decision point to support your conclusion. [3 Marks]