STATS Chapter 13 Assignment 2015 Solution

| August 30, 2017

uestion
Chapter 13 Assignment Name

Description of the Data: The data set contains part of the data for a study of oral condition of cancer patients conducted at the Mid-Michigan Medical Center. The oral conditions of the patients were measured and recorded at the initial stage, at the end of the second week, at the end of the fourth week, and at the end of the sixth week. The variables age, initial weight and initial cancer stage of the patients were recorded. Patients were divided into two groups at random: one group received a placebo and the other group received aloe juice treatment.
Sample size:, n = 25 patients with neck cancer. The treatment is Aloe Juice. (See the Excel File “Chapter 13 Dataset” to complete the questions below.)

Variable Names:

ID- Patient ID

TRT- treatment group: 0 = placebo; 1 = aloe juice

AGE- patient’s age in years

WEIGHTIN- patient’s weight at the initial stage

STAGE- initial cancer stage, coded 1 through 4

TOTALCIN- oral condition at the initial stage

TOTALCW2- oral condition at the end of week 2

TOTALCW4- oral condition at the end of week 4

TOTALCW6- oral condition at the end of week 6

Research Question: Is there a difference in oral condition at the end of week 2 and at the end of week 4? In other words, we want to know if there is a difference between two related samples. (Assume the samples are not normally distributed.)

1. What type of test will we perform?

2. What is the parametric version of this type of test?

3. List some of the pros and cons of using nonparametric tests.

4. List the assumptions for this type of analysis.

5. Are the dependent variables a continuous measurement?

6. Identify the null and alternative hypothesis.

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Now, let’s perform our analysis.

Refer to the output below to answer the questions.

Statistical Output

Descriptive Statistics

N

Mean

Std. Deviation

Minimum

Maximum

TOTALCW2

25

8.28

2.54

4.00

16.00

TOTALCW4

25

10.36

3.47

6.00

17.00

Ranks

N

Mean Rank

Sum of Ranks

TOTALCW2 – TOTALCW4

Negative Ranks

16

10.16

162.50

Positive Ranks

3

9.17

27.50

Ties

6

Total

25

Test Statistics

TOTALCW2 – TOTALCW4

Z

-2.72

Asymp. Sig. (2 tailed)

.006

7. According to the analysis, what are the medians for each group?

Week 2:

Week 4:

8. Identify the appropriate test statistic and p-value for testing the claim that there is a difference in oral condition at the end of week 2 and week 4.

Test statistic:

p-value:

9. Using the analysis, calculate the effect size..0/msohtmlclip1/01/clip_image006.png”>

r =

10. Use APA style reporting to write up your results of this analysis.

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