Chap 8&9 hwk

Part 2:

Null Hypothesis: The company's average monthly income equals $6200

Alternative Hypothesis: The company's average monthly income is different from $6200

Q2.1) 5,502.76

Q2.2) p-value=0

Q2.3) 0<0.05; Because the p-value is less than 0.05, we reject the null hypothesis. This means the company's average monthly income is significantly different from the industry average of $6200

Part 3:

Null Hypothesis: Attrition rate <= 0.12

Alternative Hypothesis: Attrition rate

Q3.1) .17

Q3.2) p-value=0

Q3.3) 0<0.05; We reject the null hypothesis. There is statistical evidence that the company's attrition rate is greater than the industry benchmark of 12%

Part 4:

Null Hypothesis: Attrition and department are independent.

Alternative Hypothesis: Attrition and department are dependent.

Q4.1) Research and Development

Q4.2) Chi-square is approximately 14.2; df=2; p is approx. 0.0008

Q4.3) We reject the null hypothesis because the p-value is less than 0.05. This means there is statistically significant relationship between department and employee attrition