HR_​Hypothesis_​Testing

Part 2:

• Null hypothesis= $6200

• Alternative hypothesis≠ $6200

• Sample mean= 5099.2041

• P-value= 4.80E-25

• I reject the null hypothesis because the sample mean is not within the 0.05 significance level.

Part 3:

• Null = 12%

• Alternative ≠ 12%

• Mean= 0.1772

• P-value (one-tailed)= 1.655

• I fail to reject the null hypothesis, and the HR director should not be worried.

Part 4:

• Null: Attrition and Department are independent.

• Alternative: Attrition and Department are dependent.

• Research and Dev had the highest raw "Yes" count.

• Chi-square test stat= 5.487, df= 2, p-value= 0.006

• I reject the null hypothesis because it appears that Attrition and Department are dependent upon each other.