Scores of students taught by standard teaching method:
 [1] 79 73 72 62 76 68 70 86 75 68 73 66
Score of students taught by new teaching method:
 [1] 70 85 80 76 80 66 71 79 81 76

        Two Sample t-test

data:  std and new 
t = -1.5519, df = 20, p-value = 0.1364
alternative hypothesis: true difference in means is not equal to 0 
95 percent confidence interval:
 -9.532705  1.399371 
sample estimates:
mean of x mean of y 
 72.33333  76.40000 


        Welch Two Sample t-test

data:  std and new 
t = -1.5643, df = 19.769, p-value = 0.1336
alternative hypothesis: true difference in means is not equal to 0 
95 percent confidence interval:
 -9.493424  1.360091 
sample estimates:
mean of x mean of y 
 72.33333  76.40000 


        F test to compare two variances

data:  std and new 
F = 1.1821, num df = 11, denom df = 9, p-value = 0.8148
alternative hypothesis: true ratio of variances is not equal to 1 
95 percent confidence interval:
 0.3021557 4.2410955 
sample estimates:
ratio of variances 
          1.182056