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Final Guides

HLT 362V

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Exercise 6   What are the frequency and percentage of the COPD patients in the severe airflow limitation group who are employed in the Eckerblad et al. (2014) study?   What percentage of the total sample is retired? What percentage of the total sample is on sick leave? ..
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How can graphics and/or statistics be used to misrepresent data? Where have you seen this done?  ..
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What are the characteristics of a population for which it would be appropriate to use mean/median/mode? When would the characteristics of a population make them inappropriate to use? ..
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Exercise # 10     What demographic variables were measured at the nominal level of measurement in the Oh et al. (2014) study? Provide a rationale for your answer.   What statistics were calculated to describe body mass index (BMI) in this study? Were these appro..
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Explain the importance of random sampling. What problems/limitations could prevent a truly random sampling and how can they be prevented?   ..
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How large would your population have to be for a sample to be appropriate (i.e., rather than measuring the whole population)?   ..
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Exercise # 16: Understanding Independent Samples t-Test   What do degrees of freedom (df ) mean? Canbulat et al. (2015) did not provide the dfs in their study. Why is it important to know the df for a t ratio? Using the df formula, calculate the df for this study.   What..
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Explain when a z-test would be appropriate over a t-test.   ..
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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)? ..
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Mayland et al. (2014) do not provide the degrees of freedom (df) in their study. Use the degrees of freedom formulas provided at the beginning of this exercise to calculate the group df and the error df.   What is the F value and p value for spiritual need—patient? What do these resu..
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If the result of an ANOVA experiment was “not significant”, was the experiment a failure? Provide reasoning and examples (real or hypothetical) to support your argument. ..
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What is an interaction? Describe an example; what are the variables within your population (work, social, academic, etc.) for which you might expect interactions? ..
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Exercise # 14: Understanding Simple Linear Regression   According to the study narrative and Figure 1 in the Flannigan et al. (2014) study, does the APLS UK formulae under- or overestimate the weight of children younger than 1 year of age? Provide a rationale for your answer. &nb..
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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.    ..
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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? ..
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