Homewor chap 8-9_​Laura Navarro

Part 2 Annotation:
State the Null:

H₀: μ = 6200

Hₐ: μ ≠ 6200

Q2.1: 6,200

Q2.2: 0 < 0.05

Q2.3: Reject H₀

Part 3 Annotation:
State the Null:
H₀: p ≤ 0.12

Hₐ: p > 0.12

Q3.1: 0.171 or 17.1% attrition rate
Q3.2: 0
Q3.3: Reject H₀ because is less than 0.05. According to the statistical evidence, the company's attrition rate is more than 12%.

Hypothesis:
H₀: Attrition and Department are independent
Hₐ: Attrition and Department are dependent
Q4.1: Research and Development

Q4.2:
Chi-square = 6,951.549
df = 2
p-value ≈ 0

Q4.3: Reject the null hypothesis. This means there is a significant relationship between department and attrition; attrition is not independent of department.