HR_​Hypothesis_​Testing - Wilson

H0: The company's average monthly income is not significantly different than the national average.

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

Q2.1: Sample Mean: 5,502.76

Q2.2: p-value: 2.03E-14

Q2.3: We would reject the null because the p value is less than than the significance level of 0.05. I would tell the CEO that statistically we have found our company's average monthly income is significantly less than the national average.

H0: The company's attrition rate is not significantly different than the national average.

Ha: The company's attrition rate is significantly different than the national average.

Q3.1: Sample Proportion of attrition: 0.1711

Q3.2: One-tail p-value: 3.34E-7

Q3.3: We would reject the null hypothesis because the p value is less than the significance level of 0.05. There is statistical evidence for the HR director to be worried because the attrition rate is significantly different than the national average.

H0: Attrition is independent of the department an employee is in.

Ha: Attrition is dependent on the department an employee is in.

Q4.1: Highest Yes for Attrition: Research & Development (124,646)

Q4.2:

Chi-Square test statistic: 0

Degrees of freedom (df): 2

Exact p-value: 1

Q4.3: I would fail to reject the null hypothesis because the p-value is 1 and that means the data supports the null hypothesis. In plain English this means attrition is independent of the department an employee is in.