1. Satisfactional Level vs Last Evaluation

Correlation

## 
##  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

Technical Interpretation

The p value is greater than alpha (0.01) therefore we reject the Ho and conclude that there is a small and positive correlation between satisfaction level and last job evaluation

Non-technical Terms Interpretation

As last evaluation increases, satisfaction levels increase, slightly.

The Graph

2. Satisfaction Level vs Average Monthly Hours

Correlation

## 
##  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

Technical Interpretation

The p value is greater than alpha (0.01) therefore we reject the Ho, and conclude that there is no correlation between satisfaction and average monthly hours

Non-technical Terms Interpretation

The amount of hours has no effect on employee satisfaction.

The Graph

## 3. Satisfaction Level vs Time Spent at at Company

Correlation

## 
##  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 
## -0.1008661

Technical Interpretation

The p value is less than alpha (0.01) therefore we reject the Ho and conclude that there is a small and negative correlation between satisfaction level and last job evaluation

Non-Technical Terms Interpretation

As time spent at the company increases, an employees satisfaction sightly decreases.

Graph:

4. Satisfaction Level vs Projects Completed

Correlation

## 
##  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 
## -0.1429696

Technical Interpretation

The p-value is less than alpha (0.01), therefore we reject the Ho, and conclude that there is a small and negative correlation between satisfaction level and the number of projects an employee is working on.

Non-technical Terms Interpretation

As the number of projects completed at the company increases, an employee satisfaction slightly decreases.

Graph: