# Project #52285 - Statistics

WEEK 1

Exercise 11 and 16

Excersie 11.

Introduction

Troy and Dalgas-Pelish (2003) conducted a quasi-experimental study to determine the effectiveness

of a self-care intervention (Tiredness Management Guide [TMG]) on postpartum fatigue. The study

subjects included 68 primiparous mothers, who were randomly assigned to either the experimental

group (32 subjects) or the control group (36 subjects) using a computer program. The results of

the study indicated that the TMG was effective in reducing levels of morning postpartum fatigue

from the 2nd to 4th weeks postpartum. These researchers recommend that “mothers need to be

informed that they will probably experience postpartum fatigue and be taught to assess and manage

this phenomenon” (Troy & Dalgas-Pelish, 2003, pp. 44-5).

Relevant Study Results

“A total of 80 women were initially enrolled [in the study] . . . twelve of these women dropped out

of the study resulting in a final sample of 68.” (Troy & Dalgas-Pelish, 2003, p. 39). The researchers

presented the characteristics of their sample in a table format for the experimental and control

groups (see Table 1). The researchers found no significant differences between the control and

experimental groups for any of the demographic or attribute variables.

Table 1.Sample Characteristics by group

1. What demographic variables were measured at least at the interval level of measurement?

2. What statistics were used to describe the length of labor in this study? Were these appropriate?

3. What other statistic could have been used to describe the length of labor? Provide a rationale for your

4. Were the distributions of scores similar for the experimental and control groups for the length of labor?

5. Were the experimental and control groups similar in their type of feeding? Provide a rationale for your

6. What was the marital status mode for the subjects in the experimental and control groups? Provide both

the frequency and percentage for the marital status mode for both groups.

7. Could a median be determined for the education data? If so, what would the median be for education for

the experimental and the control groups? Provide a rationale for your answer.

8. Can the findings from this study be generalized to Black women? Provide a rationale for your answer.

9. If there were 32 subjects in the experimental group and 36 subjects in the control group, why is the income

data only reported for 30 subjects in the experimental group and 34 subjects in the control group?

10. Was the sample for this study adequately described? Provide a rationale for your answer.

Excersie 16

Relevant Study Results

“The sample consisted of 50 hemodialysis patients. . . . Mean perceived renal disease severity

was moderately severe (mean = 6.74, SD = 2.97, range = 0–10), and the mean length of dialysis was

52.56 months (SD = 36.51). There were no differences in clinical and demographic characteristics

of the patients between the groups (p <0.05). The data indicates homogeneity of subjects across

the groups” (Tsay & Hung, 2004, p. 61). “This study found that there were significant differences

in improvement of empowerment, self-care self-efficacy, and depression in patients who were in

the intervention group using empowerment strategies than with the control group patients. . . .The results from this study suggest that empowerment techniques might have an important role

for patients in self-management of ESRD. . . . The study provides a foundation for future studies of

empowerment interventions for self-managing of ESRD patients” (Tsay & Hung, 2004, pp. 63–4).

TABLE 2.

1. The researchers analyzed the data they collected as though it were at what level of measurement?

a. nominal

b. ordinal

c. interval/ratio

d. experimental

2. What was the mean posttest empowerment score for the control group?

3. Compare the mean baseline and posttest depression scores of the experimental group. Was this an expected

finding? Provide a rationale for your answer.

4. Compare the mean baseline and posttest depression scores of the control group. Do these scores strengthen

or weaken the validity of the research results? Provide a rationale for your answer.

5. Which group’s test scores had the least amount of variability or dispersion? Provide a rationale for your

.

6. Did the empowerment variable or self-care self-efficacy variable demonstrate the greatest amount of dispersion?

7. The mean (X—) is a measure of _____________ ______________ of a distribution while the SD is a measure

of _______________________ of its scores. Both X

and SD are _______________________ statistics.

8. What was the mean severity for renal disease for the research subjects? What was the dispersion or variability

of the renal disease severity scores? Did the severity scores vary significantly between the control

and the experimental groups? Is this important? Provide a rationale for your answer.

9. Which variable was least affected by the empowerment program? Provide a rationale for your answer.

10. Was it important for the researchers to include the total means and SDs for the study variables in

Table 2 to promote the readers’ understanding of the study results? Provide a rationale for your answer.

+ an EXCEl worksheet

 Subject Mathematics Due By (Pacific Time) 12/20/2014 12:00 am
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