21. Given: m = 14, $1 = 12.1, x, = 72.7 & my = 11, $2 =14.7, x, =70.1, answer the questions below, or state what additional information you would need in order to do so: [3] a) What would the critical value(s) of / be for the pooled variance / test for this data: HA: / # 1 , a= 0.05 b) What would the observed (calculated) value of : be for the pooled variance f test for this data