A popular theory is that presidential candidates have an advantage if they are taller than their main opponents. Listed are heights (in centimeters) of randomly selected presidents along with the heights of their main opponents. Complete parts (a) and (b) below. Height (cm) of President 190 169 177 186 188 165 Height (cm) of Main Opponent 178 179 177 173 194 183 . . . (Type integers or decimals. Do not round.) Identify the test statistic. t= (Round to two decimal places as needed.)