1) discussion

create a thread and 2 replies

create a thread 100 words

2 replies each 50 words

2) home work as per attachment

3) quiz

Remember to submit your work following the file naming convention FirstInitial.LastName_M01.docx. For example, J.Smith_M01.docx. Remember that it is not necessary to manually type in the file extension; it will automatically append. Start by reading and following these instructions: Quickly skim the questions or assignment below and the assignment rubric to help you focus. Read the required chapter(s) of the textbook and any additional recommended resources. Some answers may require you to do additional research on the Internet or in other reference sources. Choose your sources carefully. Consider the course discussions so far and any insights gained from it. Create your Assignment submission and be sure to cite your sources if needed, use APA style as required, and check your spelling. Assignment: For this week please complete the following two assignments: Download the Module 7 Homework .docx. Compete all 20 homework questions for a total of 100 points. Please address all assigned questions using a different colored font. Include your name on the document before saving and submitting to the dropbox. Download the Module 7 Homework.xlsx. You will use the excel file to complete the AVOVA and Chi-square calculations. Then upload the Excel file to the dropbox. Submit only your Word file with your completed answers for this assignment. M7 Assignment UMBO – 4, 5 M7 Assignment PLG – 4 M7 Assignment CLO – 1, 2, 3, 4

Start by reading and following these instructions: You are responsible for minimally at least 3 posts for each question in your discussion boards; your initial post and reply to two of your classmates. Your initial post(s) should be your response to the questions posed in the discussion question. You should research your answer and cite at least one scholarly source when appropriate, and always use quality writing. The discussion board is never a place to use text language or emoticons. You will also be asked to respond to your classmates. This is designed to enhance the academic discussion around the topic. It is all right to disagree with something posted by another, however your responses should always be thoughtful and respectful and reflect your opinions professionally. Discussion Question: You are working as a statistician with the Boston Police department. You were given this case to work on to see if there is enough data to support an arrest warrant. Kristen Gilbert started working at the VAMC as a nurse in 1989. A proficiency report obtained by the Boston Police Department, which described her as “highly skillful”, calm, and compassionate. She organized charity drives, collections for the needy, and organized a memorial service for a colleague who died of cancer (CBS News, Killer Nurse Gets Life, 2009). However, Gilbert did tend to be nearby when patients died. Coworkers sometimes referred to her as the “angel of death”. Eventually her fellow nurses grew suspicious. Gilbert’s coworkers stated to raise concerns about an increase in medical emergencies (codes) and deaths in Ward C between August 1995 and February 1996. A criminal investigation was launched in February and Gilbert left her job shortly after learning she was the target of the investigation. The search warrant of hospital records showed that on Ward C between January 1, 1995 and February 19, 1996 Gilbert was present or on duty for 40 codes which ended in death. As the statistician for this case answer the following question What information would you need to see if there is an association between Gilbert being on duty and code/death rates? What other explanations might there be for why Gilbert had more deaths on her shifts? What type of statistical test would you use for this case to see if there is an association? What are your null hypotheses and alternative hypotheses? The following is an analysis of 1641 eight-hour shifts. Use this data to decide if there is enough statically support for an arrest warrant. (Use 95% confidence interval) Deaths during shift? Gilbert present Yes No Yes 40 217 No 34 1350 DQ1 UMBO – 4, 5 DQ1 PLG – 4 DQ1 CLO – 1, 2 When you are ready for the discussion, do the following: Click on the discussion link above. Start your answer by clicking “Start a New Thread” button with the title of your answer and the body of text following the guidance above. To properly post your answer, please click on the “Post” button. After posting your contribution, read what others have posted, reply to at least two of those posts, and respond (when appropriate) to those who have responded to you. To reply to a classmate’s post: Click on the title of another student’s post. Click “Reply to Thread” and type your response to the student. Click the “Post” button to post your reply.

## Problem 1

A | B | C | D | Problem: A realtor wants to compare the mean sales-to-appraisal ratios of residential properties sold in four neighborhoods (A, B, C, and D). Four properties are randomly selected from each neighborhood and the ratios recorded for each, as shown in the chart. | |||

1.2 | 2.5 | 1 | 0.8 | ||||

1.1 | 2.1 | 1.5 | 1.3 | ||||

0.9 | 1.9 | 1.1 | 1.1 | ||||

0.4 | 1.6 | 1.3 | 0.7 |

## Problem 2

Barth | Tornado | Reiser | Shaw | Problem: As part of an evaluation program, a sporting goods retailer wanted to compare the downhill coasting speeds of 4 brands of bicycles. She took 3 of each brand and determined their maximum downhill speeds. The results are presented in miles per hour in the table below. Use α = 0.05 | ||

43 | 37 | 41 | 43 | |||

46 | 38 | 45 | 45 | |||

43 | 39 | 42 | 46 |

## Problem 3

A | B | C | D | Problem: Four surgical procedures currently are used to install pacemakers. If the patient does not need to return for follow-up surgery, the operation is called a “clear” operation. A heart center wants to compare the proportion of clear operations for the 4 procedures, and collects the following numbers of patients from their own records (see chart). They will use this information to test for a difference among the proportion of clear operations using a chi-square test with a level of significance of 0.05. | |||

Clear | 27 | 41 | 21 | 7 | |||

Return | 11 | 15 | 9 | 11 | |||

Total | 38 | 56 | 30 | 18 | |||

## Sheet4

Non-College Degree | College Degree | Problem: A study was conducted to determine whether the use of seat belts in motor vehicles depends on the educational status of the parents. A sample of 792 children treated for injuries sustained from motor vehicle accidents was obtained, and each child was classified according to (1) parents’ educational status (College Degree or Non-College Degree) and (2) seat belt usage (worn or not worn) during the accident. Use alpha – 0.05 | ||||

Seat Belts not worn | 31 | 148 | ||||

Seat Belts worn | 283 | 330 | ||||

total | 314 | 478 |

Remember to submit your work following the file naming convention FirstInitial.LastName_M01.docx. For example, J.Smith_M01.docx. Remember that it is not necessary to manually type in the file extension; it will automatically append.

Start by reading and following these instructions:

- Quickly skim the questions or assignment below and the assignment rubric to help you focus.
- Read the required chapter(s) of the textbook and any additional recommended resources. Some answers may require you to do additional research on the Internet or in other reference sources. Choose your sources carefully.
- Consider the course discussions so far and any insights gained from it.
- Create your Assignment submission and be sure to cite your sources if needed, use APA style as required, and check your spelling.

Assignment:

For this week please complete the following two assignments:

- Download the Module 7 Homework .docx. Compete all 20 homework questions for a total of 100 points. Please address all assigned questions using a different colored font. Include your name on the document before saving and submitting to the dropbox.
- Download the Module 7 Homework.xlsx. You will use the excel file to complete the AVOVA and Chi-square calculations. Then upload the Excel file to the dropbox.
- Submit only your Word file with your completed answers for this assignment.

M7 Assignment UMBO – 4, 5

M7 Assignment PLG – 4

M7 Assignment CLO – 1, 2, 3, 4

Please complete the following questions. Provide your answers in a different colored font to make them easily identifiable. Use the excel Module 7 Homework file to complete the calculations. Include your name on this answer sheet.

Problem 1

A realtor wants to compare the mean sales-to-appraisal ratios of residential properties sold in four neighborhoods (A, B, C, and D). Four properties are randomly selected from each neighborhood and the ratios recorded for each, as shown below.

A: 1.2, 1.1, 0.9, 0.4 C: 1.0, 1.5, 1.1, 1.3

B: 2.5, 2.1, 1.9, 1.6 D: 0.8, 1.3, 1.1, 0.7

Answer the following question. For decimals, round to four decimal places.

1. State the null hypothesis for this test.

2. The grand mean for these observations is ____________

3. The SST for these observations is ____________

4. The SSA for these observations is ____________

5. The total degrees of freedom is _________________

6. The SSW is _________________

7. The within group mean square is _________________

8. The MSA is __________

9. At the 0.05 level of significance, the test statistic would be ________

10. The degrees of freedom are ________

11. Using α = 0.05, the critical value for this test would be ________

12. What is the p value _______

13. What is your conclusion?

14. For the post hoc comparison you will have ____ pairwise comparisons.

15. The Bonferroni alpha is ______

16. Which pairs have a p value smaller than Bonferroni alpha? ______________

17. What is your conclusion?

Problem 2

As part of an evaluation program, a sporting goods retailer wanted to compare the downhill coasting speeds of 4 brands of bicycles. She took 3 of each brand and determined their maximum downhill speeds. Use α = 0.05

18. State the null hypothesis for the test:

19. State the alternative hypothesis:

20. The total degrees of freedom is _______

21. The amount of total variation or *SST *is __________.

22. The among group variation or *SSA *is __________.

23. The within group variation or *SSW *is __________.

24. The value of *MSA *is __________

25. The *MSW *is __________.

26. The degrees of freedom are ________

27. The null hypothesis that the mean downhill coasting speeds of the 4 brands of bicycles are equal will be rejected at a level of significance of 0.05 if the value of the test statistic is greater than __________.

28. In testing the null hypothesis that the mean downhill coasting speeds of the 4 brands of bicycles are equal, the value of the test statistic is __________.

29. What is your conclusion for this hypothesis test?

30. For the post hoc comparison you will have ____ pairwise comparisons.

31. The Bonferroni alpha is ______

32. Which pairs have a p value smaller than Bonferroni alpha? ______________

33. What is your conclusion?

Problem 3

Four surgical procedures currently are used to install pacemakers. If the patient does not need to

return for follow-up surgery, the operation is called a “clear” operation. A heart center wants to

compare the proportion of clear operations for the 4 procedures. They will use this information to test for a difference among the proportion of clear operations using a chi-square test with a level of significance of 0.05.

34. State the null hypothesis:

35. State the alternative hypothesis:

36. The test will involve _________ degrees of freedom.

37. The overall or mean proportion of clear operations is __________.

38. The expected cell frequency for the Procedure A/Clear cell is __________.

39. The expected cell frequency for the Procedure D/Return cell is __________.

40. The critical value of the test is ________.

41. The value of the test statistic is _________.

42. The p value is ______.

43. What is your conclusion?

Problem 4

A study was conducted to determine whether the use of seat belts in motor vehicles depends on the educational status of the parents. A sample of 792 children treated for injuries sustained from motor vehicle accidents was obtained, and each child was classified according to (1) parents’ educational status (College Degree or Non-College Degree) and (2) seat belt usage (worn or not worn) during the accident. The number of children in each category is given in the table on problem 4 of the excel document.

44. Which test would be used to properly analyze the data in this experiment?

45. What would be the null hypothesis:

46. State the alternative hypothesis:

47. You will reject the H0 if _______________

48. The calculated test statistic is _____.

49. At 5% level of significance, the critical value of the test statistic is____

50. At 5% level of significance, there is sufficient evidence to conclude what?

Hypothesis Test Answer to question one The information that is needed to see whether there is an association between Gilbert being on duty and deaths is data table showing the number of deaths when Gilbert is on shift and when he is not on shift and the total number of patients in a shift. Answer to question two On the other hand, the deaths could have just occurred during Gilbert’s shift by coincidence or chance. Sometimes relationships of occurrences do not mean causation. Answer to question three The statistical test to be used in this case is chi-square test of association. This is because we are dealing with categorical data which is in form of a contingency table. Chi-square always tests for independence of occurrences. Answer to question three Hypothesis H0: There is no association between Gilbert’s presence and occurrence of patients’ deaths during his shift. H1: There is a significant association between Gilbert’s presence and occurrence of patients’ deaths during his shift. Alpha = 0.05