##
## 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 207.4192We reject the Ho, p-value < 0.01, where the average monthly hours for employees that that left is greater.
Employees that work more hours are more likely to leave.
##
## 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 207.4192We reject the Ho, p-value < 0.01, where the satisfaction level for employees that left is lower.
Employees with lower satisfaction levels are more likely to leave.
##
## 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 0.7181126We fail to reject the null hypothesis (Ho), with a p-value of 0.4683, which is greater than 0.01, indicating no significant difference in time spent at the company between employees who left and stayed.
There is no significant difference in last evaluation scores between employees who stayed and those who left.
##
## Welch Two Sample t-test
##
## data: hr$time_spend_company by hr$left
## t = -22.631, df = 9625.6, 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:
## -0.5394767 -0.4534706
## sample estimates:
## mean in group stayed mean in group left
## 3.380032 3.876505We reject the Ho, p-value < 0.01, where the time spent at the company for employees that left is significantly different from those who stayed.
Employees who left the company spent a significantly different amount of time at the company compared to those who stayed.