**$ 19.00**

# Week 3 Assignment | Complete Solution

- From Mathematics, Statistics

- ExpertT
- Rating : 109
- Grade :
**A+** - Questions : 0
- Solutions : 1026
- Blog : 0
- Earned : $52746.94

Week 3 Assignment

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

Use Tables => Contingency => with summary-will cover in the Collaborate session

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

2. Write a paragraph summarizing the results of the analysis in Exercise 1.

Key things to include in a write:

• What the study is about (i.e. what is the research question?)

• Where the results are significant or not

• A conclusion sentence to indicate the answer to the research question (i.e., is there an effective of the IV or not?

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

Use Tables => Contingency => with summary -will cover in the Collaborate session

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.

See #2

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

a. χ2 = 3.02, df = 1, α = 0.05 indicate if sig or not sig

b. χ2 = 8.09, df = 2, α = 0.05

c. χ2 = 10.67, df = 3, α = 0.01

d. χ2 = 9.88, df = 2, α = 0.01

Use chi-square table on page 416

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

Use Blue slides #19

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.

Use Blue slides #19

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?

This data file can be found under “Week Three”

Use Tables => Contingency => with Data

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 Potential Answer for Each - Fisher’s, Yates, or Chi-square

## [Solved] Week 3 Assignment | Complete Solution

- This Solution has been Purchased 1 time
- Submitted On 29 Jul, 2015 02:28:11

- ExpertT
- Rating : 109
- Grade :
**A+** - Questions : 0
- Solutions : 1026
- Blog : 0
- Earned : $52746.94