This two-part question is worth twice as much as any of the one-part questions. Parts (a) and (b) below are each worth as much as any other question in this exam. The contingency table below shows the results from a survey of 451 randomly selected adults who live in Macomb County. This survey was conducted to test the claim that adults' household sizes and age category are independent. 1 person 2 people 3 people 4 people 5+ people 18-30 44 37 35 36 41 31-61 31 42 30 39 46 62 & older 19 14 16 13 8 (a) At a = 0.2, what is the critical value? O 20.603 11.030 19.311 12.027 None of these (b) Find the expected frequency (E) used in the calculation of the x2 test statistic for the cell in the first row (18-30) and fifth column (5+ people). O 447. 195 O 0.639 40.654 Oo ONone of these