HR Hypothesis Testing

Part 2

Q2.1: Sample mean = 5099.204

Q2.2: 0.000

Q2.3: Because the p-value is less than 0.05, we reject the null hypothesis and conclude that the company's average monthly income is significantly different from $6,200.

Part 3

Ho: p= 0.12

Ha: p> 0.12

Q3.1: Sample Proportion = 0.177

Q3.2 One-tail value = 0.000

Q3.3: Decision: Reject Ho

Because the one-tail p-value is less than 0.05, we reject the null hypothesis and conclude that the attribution rate is significantly greater than 12%. This means the HR Director has statistical evidence to be concerned about employee attrition.

Part 4

Ho: Attrition and Department are independent variables.

Ha: Attrition and Department are dependent variables.

Q4.1: Department with the highest raw count of attrition: Research and Development.

Q4.2 Chi-Square Statistic = 5.487

df= 2

p-value = 0.064

Q4.3: Decision: Fail to Reject Ho

Because the p-value is greater than 0.05, we fail to reject the null hypothesis. There is not enough statistical evidence to conclude that attrition and department are related. This suggests that the department an employee works in does not significantly influence whether they leave the company.