Assignment 7 - Correlations
Estella Schlosser and Peyton Smith
2026-03-19
1. Correlation - satisfaction level with last evaluation
##
## Pearson's product-moment correlation
##
## data: hr$satisfaction_level and hr$last_evaluation
## t = 12.933, df = 14997, p-value < 2.2e-16
## alternative hypothesis: true correlation is not equal to 0
## 95 percent confidence interval:
## 0.08916727 0.12082195
## sample estimates:
## cor
## 0.1050212Technical interpretation:
The p-value < than alpha (0.001). Therefore we reject the Ho and say there is a positive and small correlation between last evaluation and satisfaction level.
Non - technical interpretation:
As evaluations increase, satisfactions levels increases slightly.
2. Correlation - number of projects and average monthly hours
##
## Pearson's product-moment correlation
##
## data: hr$number_project and hr$average_montly_hours
## t = 56.219, df = 14997, p-value < 2.2e-16
## alternative hypothesis: true correlation is not equal to 0
## 95 percent confidence interval:
## 0.4039037 0.4303411
## sample estimates:
## cor
## 0.4172106Technical interpretation:
The p-value < than alpha (0.001). Therefore we reject the Ho and say there is a positive and moderate correlation between number of projects and average monthly hours.
Non - technical interpretation:
As the number of projects increase, average monthly hours also increases.
3. Correlation - satisfaction level and number of projects
##
## Pearson's product-moment correlation
##
## data: hr$satisfaction_level and hr$number_project
## t = -17.69, df = 14997, p-value < 2.2e-16
## alternative hypothesis: true correlation is not equal to 0
## 95 percent confidence interval:
## -0.1586105 -0.1272570
## sample estimates:
## cor
## -0.1429696Technical interpretation:
The p-value < than alpha (0.001). Therefore we reject the Ho and say there is a negative and weak correlation between satisfaction level and satisfaction number of projects.
Non - technical interpretation:
Employees with more projects tend to be less satisfied
4. Correlation - satisfaction level and time spent at company
##
## Pearson's product-moment correlation
##
## data: hr$satisfaction_level and hr$time_spend_company
## t = -12.416, df = 14997, p-value < 2.2e-16
## alternative hypothesis: true correlation is not equal to 0
## 95 percent confidence interval:
## -0.11668153 -0.08499948
## sample estimates:
## cor
## -0.1008661Technical interpretation:
The p-value < than alpha (0.001). Therefore we reject the Ho and say there is a negative and weak correlation between satisfaction level and time spent at company
Non - technical interpretation:
Employees who have been at the company longer tend to be slightly less satisfied.