What can you conclude about smoking and depression

Reference no: EM13759201

Question :1. Using StatCrunch, calculate the chi-square statistic and degrees of freedom for the following set of data for 300 people:

Group A Group B Group C Total
Had flu shot 20 30 32 82
Didn't have flu shot 80 70 68 218
Total 100 100 100 300

Is the value of the chi-square statistically significant at the 0.05 level?

2. Write a paragraph summarizing the results of the analysis.

3. Using StatCrunch, calculate the chi-square statistic and degrees of freedom for the following set of data for 180 people undergoing a knee replacement treatment with a drug supplement:

Treatment with drug X Treatment without Drug X Total
Had > 8 wk rehab 18 32 50
Had < 8 wk rehab 70 60 130
Total 88 92 180

Is the value of the chi-square statistically significant at the 0.05 level?

4. Write a paragraph summarizing the results of the analysis in Exercise 3.

5. Given each of the following circumstances, determine whether the calculated values of chi-square are statistically significant:

a. ?2 = 3.02, df = 1, ? = 0.05
b. ?2 = 8.09, df = 2, ? = 0.05
c. ?2 = 10.67, df = 3, ? = 0.01
d. ?2 = 9.88, df = 2, ? = 0.01

6. Match each of the nonparametric tests in Column A with its parametric counterpart in Column B

A. Nonparametric Test B. Parametric Test
1. Mann-Whitney U-test a. Paired t-test
2. Friedman test b. One-way ANOVA
3. Kruskall-Wallis test c. Independent groups t-test
4. Wilcoxon signed-ranks test d. Repeated measures ANOVA

7. Using the information provided, indicate which statistical test you think should be used for each of the following situations:

a. Independent variable: normal birth weight vs. low birth weight infants; dependent variable: breathing rate (in breaths per minute).
b. Independent variable: time of measurement of same patient (before, during, and after surgery); dependent variable: heart rate.
c. Independent variable: time of measurement (before, during, and after intervention); dependent variable: did vs did not exercise regularly.
d. Independent variable: infertility treatment A vs infertility treatment B vs control condition; dependent variable: did vs did not become pregnant.

8. The relationship between cigarette smoking and major depressive disorder has been studied for decades. In the doc sharing area of the course, you will find an excel spreadsheet of data from a study on smoking and depression by the St Louis Epidemiologic Catchment Area Survey of the National Institute of Mental Health. The file is labeled "Catchment Area Survey". Using this data set in StatCrunch, calculate the chi-square statistic and degrees of freedom for the items "smoker" and a measure of depression, "FeltDown". Construct a contingency table for this data as we did in week 1. Be sure to include and label the row, column and total %'s as well as the expected counts. Is the value of the chi-square statistically significant at the 0.05 level? Any reason to use a correction to the chi-square test here given your expected counts?

9. Write a paragraph summarizing the results of the analysis in Exercise 8. What can you conclude about smoking and depression ("Feeling Down") in this sample?

10. Below are three (a-c) sets of cells of 2 X 2 contingency tables including the expected frequencies (Totals not included). Identify which statistical procedure would be appropriate for each, using the most conservative approach.

a.
Aspirin Taker?
Cancer No Yes
Yes
% within Cancer
% within Aspirin Taker
% of Total
Expected Counts 28
(58.33%)
(29.17%)
(15.14%)
24.91 20
(41.67%)
(22.47%)
(10.81%)
23.09
No
% within Cancer
% within Aspirin Taker
% of Total
Expected Counts 68
(49.64%)
(70.83%)
(36.76%)
71.09 69
(50.36%)
(77.53%)
(37.3%)
65.91

b.
Room Type
Infection Concrete Linoleum
Yes
% within Infection
% within Room Type
% of Total
Expected Counts 2
(9.091%)
(5.882%)
(1.626%)
6.08 20
(90.91%)
(22.47%)
(16.26%)
15.9
No
% within Infection
% within Room Type
% of Total
Expected Counts 32
(31.68%)
(94.12%)
(26.02%)
27.9 69
(68.32%)
(77.53%)
(56.1%)
73.1

c.
Smoker
Diabetes No Yes
Yes
% within Diabetes
% within Smoker
% of Total
Expected Counts 2
(25%)
(4.878%)
(2.439%)
4 6
(75%)
(14.63%)
(7.317%)
4
No
% within Diabetes
% within Smoker
% of Total
Expected Counts 39
(52.7%)
(95.12%)
(47.56%)
37 35
(47.3%)
(85.37%)
(42.68%)
37

Reference no: EM13759201

Questions Cloud

Characteristics of information security : Select one of the three characteristics of information security (CIA) and explain its importance as related to the development of policy, education, OR technology

Explain problem solving discussions and demonstrations : Explain Problem Solving, Discussions, Exploratory play, Guided discovery, Direct Instruction and Demonstrations. Identify what standards from your state support these activities.

Question regarding the investment and portfolio analysis : One of the core business areas of A.P. Investments is active asset allocation and to be successful in this area it is important that A.P. Investments has superior stock picking skills.

Benefits of networking within an integrated system : What are the benefits of networking within an integrated system? What are the challenges of networking within an integrated system

What can you conclude about smoking and depression : Calculate the chi-square statistic and degrees of freedom for the following set of data for 180 people undergoing a knee replacement treatment with a drug supplement - Kruskall-Wallis test c. Independent groups t-test.

Collaboration and communication systems : How do enterprise applications, collaboration and communication systems, and intranets improve organizational performance? Give examples to illustrate your answer

Create a local database that will synchronize data : In the prior phase, you started work on some of the application's graphical user interface (GUI). In this assignment, you will add a data entry form to the GUI and create a local database that will synchronize data to the isolated storage containe..

Discuss the link between strategy and training : Develop and discuss the link between strategy and training and development in the organization.

Discuss the neolithic revolution : Discuss the Neolithic Revolution, citing its importance in terms of laying the groundwork for the ongoing development of technological advances throughout history

User Account

All Pages