1. Satisfaction level and 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 
## 0.1050212

Techincal Interpretation

  • The p-value is less than alpha (0.01) therefor we reject the null and conclude that there is correlation between satisfaction level and last evaluation.
  • There is a weak positive correlation between satisfaction level and an employees last evaluation.

Non-Technical Interpretation

  • Satisfaction level increases slightly as employees last evaluation increases.

2. Average monthly hours and last evaluation.

## 
##  Pearson's product-moment correlation
## 
## data:  hr$average_montly_hours and hr$last_evaluation
## t = 44.237, df = 14997, p-value < 2.2e-16
## alternative hypothesis: true correlation is not equal to 0
## 95 percent confidence interval:
##  0.3255078 0.3538218
## sample estimates:
##       cor 
## 0.3397418

Technical Interpretation

  • The p-value is less than alpha (0.01) therefor we reject the null and conclude that there is correlation between average monthly hours worked and last evaluation.
  • There is a weak to moderate positive correlation between average monthly hours worked and last evaluation.

Non-Technical Interpretation

  • Last evaluation increases as average monthly hours increases.

3. Average monthly hours and satisfaction level.

## 
##  Pearson's product-moment correlation
## 
## data:  hr$average_montly_hours and hr$satisfaction_level
## 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) therefor we accept the null and conclude there is no correlation between average monthly hours worked and satisfaction level.

Non-Technical Interpretation

  • there is no correlation between average monthly hours worked and satisfaction level

4. Time spent at company and satisfaction level.

## 
##  Pearson's product-moment correlation
## 
## data:  hr$time_spend_company and hr$satisfaction_level
## 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) therefor we reject the null and conclude there is a correlation between time spent at company and satisfaction level.
  • there is weak negative correlation between time spent at company and satisfaction level.

Non-Technical Interpretation

  • Satisfaction level decreases as time spent at company increases.