HLT 362 Week 1

Assignments

Module 1 Descriptive Statistics Excel Worksheet

A formula for the sample mean is

A formula for the sample variance is

A formula for the sample standard deviation is

A computational formula for the sample variance is

For the following sample of scores:

2, 6, 1, 4, 2, 2, 4, 3, 2

Find the mean, variance and standard deviation

A sample of size 7 (n = 7) has a mean of M = 9.

One of the sample scores is changed from x = 19 to x = 5. What is the value for the new sample mean?

Using Excel create a histogram and a line graph using the scores in the following table:

Module 1 Exercise 16

The researchers analyzed the data they collected as though it were at what level of measurement? (Your choices are: Nominal, Ordinal, Interval/ratio, or Experimental)

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

Compare the mean baseline and posttest depression scores of the experimental group. Was this an expected finding? Provide a rationale for your answer.

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.

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

Did the empowerment variable or self-care self-efficacy variable demonstrate the greatest amount of dispersion? Provide a rationale for your answer.

The mean (X ?) is a measure of a distribution while the SD is a measure of its scores. Both X ? and SD are statistics.

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.

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

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.

Discussion Questions

How could graphics and/or statistics be used to misrepresent data? Where have you seen this done?

What are the characteristics of a population for which a mean/median/mode would be appropriate? Inappropriate?