Question 1: Satisfaction by left
##
## 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:
- We reject the Ho because the p-value < alpha (0.001) meaning that
there is a difference in means of satisfaction_level between those that
stayed vs. those that left
Non technical Interpretation:
- Employees with lower satisfaction are more likely to leave