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Explain the importance of random sampling

HLT 362V M1 Mean Variance Standard Deviation
Mean Variance Standard Deviation HLT362V

Please type you answer in the cell beside the question.

Identify the sampling technique being used. Every 20th patient that comes into the emergency room is given a satisfaction survey upon their discharge.
random sampling
cluster sampling
systematic sampling
stratified sampling
none of the above
The formula for finding the sample mean is ______________.
The formula for finding sample standard deviation is ________________.
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HLT 362V Module 1 Exercise 16
HLT362V

1- 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)

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 answer.

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

7 – The mean (X ̅) is a measure of a distribution while the SD is a measure 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.

HLT 362V Week 1 Discussions 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?

HLT 362V Week 2 Discussions Questions
Explain the importance of random sampling. What problems/limitations could prevent a truly random sampling and how can they be prevented?

How large would your population have to be for a sample to be appropriate (i.e., rather than measuring the whole population)?

HLT 362V Week 3 Discussions Questions
Suppose you hear an “old-timer” say, “Why, in my day, kids were much more respectful and didn’t cause as much trouble as they do nowadays!” Formulate a hypothesis related to this statement that you could test. How would you test it?

Researchers routinely choose an α-level of 0.05 for testing their hypotheses. What are some experiments for which you might want a lower α -level (e.g. 0.01)? What are some situations in which you might accept a higher level (e.g. 0.1)?

Explain when a z-test would be appropriate over a t-test.

Researchers routinely choose an alpha level of 0.05 for testing their hypotheses. What are some experiments for which you might want a lower alpha level (e.g., 0.01)? What are some situations in which you might accept a higher level (e.g., 0.1)?

HLT 362V Week 4 Discussions Questions
How would you explain the analysis of variance, assuming that your audience has not had a statistics class before?

What is an interaction? Describe an example; what are the variables within your population (work, social, academic, etc.) for which you might expect interactions?

HLT 362V Week 5 Discussions Questions
Now that you are familiar with the basic concepts of statistics, what are some examples of when you have seen or heard statistics used inappropriately?

Describe the error in the conclusion. Given: There is a linear correlation between the number of cigarettes smoked and the pulse rate. As the number of cigarettes increases the pulse rate increases. Conclusion: Cigarettes cause the pulse rate to increase.

HLT 362V EXERCISE 23 Questions to be Graded
HLT362V

What is the r value for the relationship between Hamstring strength index 60°/s and the Shuttle run test? Is this r value significant? Provide a rationale for your answer.
Consider r = 1.00 and r = -1.00. Which r value is stronger? Provide a rationale for your answer.
Describe the direction of the relationship between the Hamstring strength index 60°/s and the Shuttle run test.
Without using numbers, describe the relationship between the Hamstring strength index 120°/s and the Triple hop index.
Which variable has the weakest relationship with the Quadriceps strength index 120°/s? Provide a rationale for your answer.
Which of the following sets of variables has the strongest relationship?
Hamstring strength index 120°/s and the Hop index
Quadriceps strength index 60°/s and the Carioca test
Quadriceps strength index 120°/s and the Side step test
Quadriceps strength index 60°/s and the Triple hop index
In Table 5, two r values are reported as r = -0.498 and r = -0.528. Describe each r value in words, indicating which would be more statistically significant, and provide a rationale for your answer.
The researchers stated that the study showed a positive, significant correlation between Quadriceps strength indices and pre- and postoperative functional stability. Considering the data presented in the Table 5, do you agree with their statement? Provide a rationale for your answer.
The researchers stated that no significant relationship could be described between Hamstring strength indices 60°/s and functional stability. Given the data in Table 5, explain why not.
Consider the relationship reported for the Quadriceps strength index 120°/s and the Hop index (r = 0.744**, p = 0.000 ). What do these r and p values indicate related to statistical significance and clinical importance?