KNIME_​project

Part 2: Two tail hypothesis test of a mean

H0: the population mean MonthlyIncome is equal to 6200

Ha: the population mean MonthlyIncome is not equal to 6200

Q2.1 Sample Mean of MonthlyIncome = 5502.76

Q2.2 p-value = 0.0000

Q2.3 Decision: reject the null hypothesis

Conclusion: there is strong statistical evidence that the company's avg monthly income is significantly differrent than 6,200

Part 3: one tail hypothesis test of a portion

The population portion of attrition is equal to 0.12

The population proportoin of attrition is greather than 0.12

Q3.1 sample proportion = 0.16

Q3.2 one tail p value = 0.0000

Q3.3 decision: reject the null hypothesis

Conclusion: there's no strong statistical evidence that the company's attrition rate is greater than 12%

Part 4: chi square test of independence

Attrition and Department are independent.
Attrition and Department are dependent.

Q4.1: Research & Development

Q4.2:
Chi-square ≈ 14.2
df = 2
p-value ≈ 0.0008

Q4.3: Reject the null hypothesis. There is a statistically significant relationship between department and attrition.