Name:_____________________________ Project Part B Answer the following questions using the data in a the AJ case file (the data set you already have in your course file) Answer A-D A. The Manager of AJ believe the average (mean) annual income of customers was less than $50,000. Using the data set annual income, is there convincing evidence that the true mean annual salary is less than $50,000 ? Use =.05. 1. Null hypothesis (Ho): 2. Alternative (research) hypothesis (Ha): 3. Test statistic: 4. Rejection region: 5. Assumptions: 6. Conclusion B. Is the true population proportion of customers who live in an urban area exceeds 40% 1. Null hypothesis (Ho): 2. Alternative (research) hypothesis (Ha): 1 Name:_____________________________ Project Part B 3. Test statistic: 4. Rejection region: 5. Assumptions: 6. Experiment and calculation of test statistic: 7. Conclusion: C. The AJ manager assumed average (mean) number of years lived in the current home is less than 13 years. Is this assumption correct? Choose alpha. (ii) Additionally, calculate a 95% confidence interval for this tests statistic value. 1. 2. 3. 4. 5. 6. Null hypothesis (Ho): Alternative (research) hypothesis (Ha): Test statistic: Rejection region: Assumptions: Experiment and calculation of test statistic: ( 2 Name:_____________________________ Project Part B 7. Conclusion: D. Is the average (mean) credit balance for suburban customers is more than $4300? Choose your own alpha and test the hypothesis. (ii) Additionally, calculate a 95% confidence interval for this tests statistic value. 1. 2. 3. 4. 5. Null hypothesis (Ho): Alternative (research) hypothesis (Ha): Test statistic: Rejection region: Assumptions: 3 Name:_____________________________ Project Part B 6. Experiment and calculation of test statistic: 7. Conclusion: 4