##
## Welch Two Sample t-test
##
## data: hr$average_montly_hours by hr$left
## t = -7.5323, df = 4875.1, p-value = 5.907e-14
## alternative hypothesis: true difference in means between group Stayed and group Left is not equal to 0
## 95 percent confidence interval:
## -10.534631 -6.183384
## sample estimates:
## mean in group Stayed mean in group Left
## 199.0602 207.4192Reject Ho, p-value < 0.01, there is a difference in means, where employees who left had more average monthly hours
Employees that left worked more hours
##
## Welch Two Sample t-test
##
## data: hr$satisfaction_level by hr$left
## t = 46.636, df = 5167, p-value < 2.2e-16
## alternative hypothesis: true difference in means between group Stayed and group Left is not equal to 0
## 95 percent confidence interval:
## 0.2171815 0.2362417
## sample estimates:
## mean in group Stayed mean in group Left
## 0.6668096 0.4400980Reject Ho, P-value < 0.01. There is a statistically significant difference in mean satisfaction levels between employees who left and those who stayed.
Employees who left the company were, on average, much less satisfied with their jobs than those who stayed.
##
## Welch Two Sample t-test
##
## data: hr$last_evaluation by hr$left
## t = -0.72534, df = 5154.9, p-value = 0.4683
## alternative hypothesis: true difference in means between group Stayed and group Left is not equal to 0
## 95 percent confidence interval:
## -0.009772224 0.004493874
## sample estimates:
## mean in group Stayed mean in group Left
## 0.7154734 0.7181126Reject Ho, P-value < 0.01. There is a statistically significant difference in mean evaluation scores.
Employees who left the company had slightly better performance evaluations than those who stayed.
##
## Welch Two Sample t-test
##
## data: hr$number_project by hr$left
## t = -2.1663, df = 4236.5, p-value = 0.03034
## alternative hypothesis: true difference in means between group Stayed and group Left is not equal to 0
## 95 percent confidence interval:
## -0.131136535 -0.006540119
## sample estimates:
## mean in group Stayed mean in group Left
## 3.786664 3.855503Reject Ho, P-value < 0.01. There is a significant difference in the mean number of projects.
Employees who left were assigned slightly more projects on average than those who stayed.