HR Hypothesis Test

H0: The company’s average Monthly Income is equal to 6200.

Ha: The company’s average Monthly Income is not equal to 6200.

Q2.1 Sample Mean = 5502.7633

Q2.2 p-value = 2.03E-14

Q2.3 Since p-value is less than 0.05, we reject the null hypothesis.

H0: The attrition proportion is equal to 0.12.

Ha: The attrition proportion is greater than 0.12.

Q3.1 Sample proportion = 0.1711

Q3.2 One-tail p-value = 6.68E-7 ÷ 2 = 3.34E-7

Q3.3 Since the one-tail p-value is less than 0.05, we reject the null hypothesis.

H0: Attrition and Department are independent.

Ha: Attrition and Department are dependent.

Q4.1 Department with highest “Yes” attrition count = Research & Development

Q4.2 Chi-Square statistic = 9.8442

df = 2

p-value = 0.0073

Q4.3 Since the p-value is less than 0.05, we reject the null hypothesis.