!!!t検定
 t.test(hi, li)
 
         Welch Two Sample t-test
 
 data:  hi and li 
 t = -0.6747, df = 92.932, p-value = 0.5015
 alternative hypothesis: true difference in means is not equal to 0 
 95 percent confidence interval:
  -23.57668  11.61834 
 sample estimates:
 mean of x mean of y 
  357.3125  363.2917 
*何も指定しないと、「繰返しのない」「等分散を仮定しない」Welchのt検定