Consider the following competing hypotheses and accompanying sample data drawn independently from normally distributed populations. (You may find it useful to reference the appropriate table: z table or t table) H₀: _{1 2} = 0 H_A: _{1 2} 0

x11 = 56	x22 = 61
1 = 12.00	2 = 1.65
n1 = 16	n2 = 15

a-1. Calculate the value of the test statistic. (Negative value should be indicated by a minus sign. Round final answer to 2 decimal places.)