Is there a difference in mpg betwee automatic and manual transmissions?
##
## Welch Two Sample t-test
##
## data: cars1$mpg by cars1$am_char
## t = -3.7671, df = 18.332, p-value = 0.001374
## alternative hypothesis: true difference in means between group Automatic and group Manual is not equal to 0
## 95 percent confidence interval:
## -11.280194 -3.209684
## sample estimates:
## mean in group Automatic mean in group Manual
## 17.14737 24.39231##
## Welch Two Sample t-test
##
## data: graph_data1$mpg by graph_data1$Transmission
## t = -3.7671, df = 18.332, p-value = 0.001374
## alternative hypothesis: true difference in means between group Automatic and group Manual is not equal to 0
## 95 percent confidence interval:
## -11.280194 -3.209684
## sample estimates:
## mean in group Automatic mean in group Manual
## 17.14737 24.39231##
## Welch Two Sample t-test
##
## data: graph_data1$qsec by graph_data1$Transmission
## t = 1.2878, df = 25.534, p-value = 0.2093
## alternative hypothesis: true difference in means between group Automatic and group Manual is not equal to 0
## 95 percent confidence interval:
## -0.4918522 2.1381679
## sample estimates:
## mean in group Automatic mean in group Manual
## 18.18316 17.36000