1. Correlation between satisfaction_level and average_montly_hours

## 
##  Pearson's product-moment correlation
## 
## data:  hr$satisfaction_level and hr$average_montly_hours
## t = -2.4556, df = 14997, p-value = 0.01408
## alternative hypothesis: true correlation is not equal to 0
## 95 percent confidence interval:
##  -0.036040356 -0.004045605
## sample estimates:
##         cor 
## -0.02004811

Techincal interpretation

The p-value is greater than alpha (0.01) therefore we retain the Ho and conclude that there is no corelation between satisfaction and avg monthly hours.

Non-Techincal interpretation

The amount of hours has no effect on employee satisfaction.

Graph

2. Correlation between time_spend_company and average_montly_hours

## 
##  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 
## 0.1050212

Techincal interpretation

The p-value is less than alpha (0.01) therefore we reject the Ho. We conclude that there is a small and positive correlation between satisfaction level and last evalutation.

Non-Techincal interpretation

As last evalution increases, satisfaction level increases slightly.

Graph

3.Correlation 4: promotion_last_5years and satisfaction_level

## 
##  Pearson's product-moment correlation
## 
## data:  hr$number_project and hr$satisfaction_level
## 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 
## -0.1429696

Techincal interpretation

The p-value is less than alpha (0.01) therefore we reject the Ho. We conclude that there is a small and positive correlation between number of projects and satisfaction level.

Non-Techincal interpretation

employees who have more projects expierenced a slight decrease in satisfaction level

Graph

4.Correlation 2: number_project and average_montly_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 
## 0.4172106

Techincal interpretation

The p-value is less than alpha (0.01) therefore we reject the Ho. We conclude that there is a direct positive correlation between average monthly hours and number of projects.

Non-Techincal interpretation

The More Hours an Employee Works, the More Projects They Get Assigned

Graph