jmv::ttestPS(
  data = class02,
  pairs = list(
    list(
      i1="SelfEffPre",
      i2="SelfEffPost")),
  hypothesis = "twoGreater",
  meanDiff = TRUE,
  ci = TRUE,
  effectSize = TRUE,
  ciES = TRUE,
  desc = TRUE,
  plots = TRUE)

## 
##  PAIRED SAMPLES T-TEST
## 
##  Paired Samples T-Test                                                                                                                                                                
##  ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ 
##                                                statistic    df          p             Mean difference    SE difference    Lower    Upper        Cohen's d    Lower        Upper       
##  ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ 
##    SelfEffPre    SelfEffPost    Student's t    -14.01743    99.00000    < .0000001          -3.011627        0.2148488     -Inf    -2.654894    -1.401743    -1.676349    -1.123420   
##  ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ 
##    Note. H<U+2090> Measure 1 < Measure 2
## 
## 
##  Descriptives                                                              
##  ------------------------------------------------------------------------- 
##                   N      Mean         Median       SD          SE          
##  ------------------------------------------------------------------------- 
##    SelfEffPre     100     9.612526     9.783764    3.713937    0.3713937   
##    SelfEffPost    100    12.624153    12.426876    4.023680    0.4023680   
##  -------------------------------------------------------------------------