1. t-test of average monthly hours by Left
t-test
##
## 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 0 and group 1 is not equal to 0
## 95 percent confidence interval:
## -10.534631 -6.183384
## sample estimates:
## mean in group 0 mean in group 1
## 199.0602 207.4192
Technical Interpretation
Rejecting the null h0, p-value was less than 0.01, where the
satisfaction levels for
employees that left is greater
Non-Technical Interpretation
Employees with less satisfaction levels are more likely to
leave
2. t-test of Satisfaction level by Left
t-test
##
## 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 0 and group 1 is not equal to 0
## 95 percent confidence interval:
## 0.2171815 0.2362417
## sample estimates:
## mean in group 0 mean in group 1
## 0.6668096 0.4400980
Technical Interpretation
Rejecting the null h0, p-value was less than 0.01, where the
satisfaction levels for
employees that left is greater
Non-Technical Interpretation
Less Satisfied Employees are more likely to leave
3. t-test of Evaluation Score by Left
t-test
##
## 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 0 and group 1 is not equal to 0
## 95 percent confidence interval:
## -0.009772224 0.004493874
## sample estimates:
## mean in group 0 mean in group 1
## 0.7154734 0.7181126
Technical Interpretation
Accepting the null h0, p-value was greater than 0.01, where the
evaluation score
is around the same
Non-Technical Interpretation
Employees with lower evaluation scores are not more likely to
leave
4. t-test of Time Spent in company by Left
t-test
##
## 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 0 and group 1 is not equal to 0
## 95 percent confidence interval:
## -0.5394767 -0.4534706
## sample estimates:
## mean in group 0 mean in group 1
## 3.380032 3.876505
Technical Interpretation
Rejecting the null h0, p-value was less than 0.01, where the time
spent in the company
for employees that left is less
Non-Technical Interpretation
Employees with more time spent in the company are slightly more
likely to leave