Homework 8 & 9

H0: The company's average monthly income does not differ significantly from the national average.

Ha: The company's average monthly income is significantly different from the national average.

Q2.1: mean = 5430.353

Q2.2: p = 0

Q2.3: Since p=0, I reject the null hypothesis.

H0: Our attrition proportion is not significantly higher than 0.12.

Ha: Our attrition proportion is significantly higher than 0.12.

Q3.1: 0.172

Q3.2: 0

Q3.3: I reject the null hypothesis. Since the p-value is less than the significance level, the HR director should not be worried.

H0: Attrition is independent of Department.

Ha: Attrition is dependent on Department.

Q4.1: Research and Development

Q4.2: Chi-Square: 7062.943

dF: 2

p-value: 0

Q4.3: I reject the null hypothesis. The department a person works in does not affect their likelihood of leaving.