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Week 5 final exam




Question;Final ExamFocus;of the Final Exam;The purpose of the Final Exam is to assess your understanding of the main;statistical concepts covered in this course and to evaluate your ability to;critically review a quantitative research article. The exam will consist;of two parts: Part I includes three essay questions and Part II includes a;research critique. All of your responses should be included in a single;Word document for submission.;Please include the following general headings for each section of the written;exam within your Word document:Part I: Essay Questions1. Essay 1;2. Essay 2;3. Essay 3Part II: Research Study Critique1. Introduction;2. Methods;3. Results;4. Discussion;Your;complete Word document must include a title page with the following;1. Student?s name;2. Course name and number;3. Instructor?s name;4. Date submitted;Part I: Essay QuestionsThere;are three essay questions in this section. You must answer all three;questions. The length of each essay should be one to two double-spaced;pages (excluding title and reference pages). Use 12-point font and format;your paper with regular 1-inch margins. Do not include the essay prompt;in your document. It will not count toward the length requirement for;your essays.Essay 1A group of researchers conducted an experiment to determine which;vaccine is more effective for preventing getting the flu. They tested two;different types of vaccines: a shot and a nasal spray. To test the;effectiveness, 1000 participants were randomly selected with 500 people getting;the shot and 500 the nasal spray. Of the 500 people were treated with the shot;80 developed the flu and 420 did not. Of the people who were treated with the;nasal spray, 120 people developed the flu and 380 did not. The level of;significance was set at.05. The proportion of people who were treated with the;shot who developed the flu =.16, and the proportion of the people who were;treated with the nasal spray was.24. The calculated p value =.0008.;For;this essay, describe the statistical approaches (e.g., identify the hypotheses;and research methods) used in this excerpt from a research study.;Interpret the statistical results and examine the limitations of the;statistical methods. Finally, evaluate the research study as a whole and;apply what you have learned about hypothesis testing and inferential statistics;by discussing how you might conduct a follow-up study.;Your;essay must address the following points;?;Describe the research question for this;experiment.;o;What were the null and alternative hypotheses?;o;Were the results of this test statistically;significant?;o;If so, why were they significant?;?;Would the researchers reject or fail to reject;the null hypothesis?;?;Do the results provide sufficient evidence to;support the alternative hypothesis?;?;Was the sample appropriate for this;study? Explain your answer.;?;What are some possible limitations to this;study?;?;Discuss how you would conduct a follow up study;to this one. Explain your answer.;?;Describe the difference between practical and;statistical significance.;Essay 2A;researcher has investigated the relationship between IQ and grade point average;(GPA) and found the correlation to be.75.;For;this essay, critique the results and interpretation of a correlational study.;?;Evaluate the correlational result and identify;the strength of the correlation.;?;Examine the assumptions and limitations of the;possible connection between the researcher?s chosen variables.;?;Identify and describe other statistical;tests that could be used to study this relationship.;Your;essay response must address the following questions;?;How strong is this correlation?;o;Is this a positive or negative correlation?;o;What does this correlation mean?;?;Does this correlation imply that individuals;with high Intelligence Quotients (IQ) have high Grade Point Averages;(GPA)?;?;Does this correlation provide evidence;that high IQ causes GPA to go higher?;o;What other variables might be influencing this;relationship?;?;What is the connection between correlation and;causation?;?;What are some of the factors that affect the;size of this correlation?;?;Is correlation a good test for predicting;GPA?;o;If not, what statistical tests should a;researcher use, and why?;Essay 3A;researcher has recorded the reaction times of 20 individuals on a memory assessment.;The following table indicates the individual times;2.2;4.7;7.3;4.1;9.5;15.2;4.3;9.5;2.7;3.1;9.2;2.9;8.2;7.6;3.5;2.5;9.3;4.8;8.5;8.1;In;this essay, demonstrate your ability to organize data into meaningful sets;calculate basic descriptive statistics, interpret the results, and evaluate the;effects of outliers and changes in the variables. You may use Excel, one;of the many free online descriptive statistics calculators, or calculate the;values by hand and/or with a calculator.;Next;separate the data into two groups of 10, one group will be the lower reaction;times, and the second group will be the higher reaction times. Then;address the following points in your essay response;?;Calculate the sum, mean, mode, median, standard;deviation, range, skew, and kurtosis for each group.;?;How do the two groups differ?;?;Are there any outliers in either data;group?;?;What effect does an outlier have on a sample?;Lastly;double each sample by repeating the same 10 data points in each group.;You will have a total of 20 data points for each group. After completing this;address the following in your essay response;?;Calculate the following for the new data;groups: sum, mean, mode, median, standard deviation, range, skew, and kurtosis.;?;Did any of the values change?;?;How does sample size affect those values?;Part B: Research Study CritiqueIn;this second portion of the Final Exam, you will identify and critically;evaluate a quantitative research article based on a social science topic.;Your selected article must include a research question(s) and/or hypothesis(es);and utilize statistical analyses covered in the course. The article must be;peer-reviewed and published within the last 10 years.;In the body of your critique, describe the statistical approaches used, the;variables included, the hypothesis(es) proposed, and the interpretation of the;results. In your conclusion, suggest other statistical approaches;that could have been used and, if appropriate, suggest alternative;interpretations of the results. This process will allow you to apply the;concepts learned throughout the course in the interpretation of actual scientific;research. Your critique must include the following sections;1. Introduction: This;section will include a general introduction of the quantitative study from a;peer-reviewed source published within the last 10 years. The research;questions and/or hypothesis(es) as well as the purpose of the study should be;clearly defined.;2. Methods;Describe and evaluate the procedures and methods of data collection;measures/instruments used, the participants and how they were selected, and the;statistical techniques used.;3. Results: In;this section describe and critique the results presented in the study.;4. Discussion;Discuss and evaluate the efficacy of the results presented in the study.;Address, the strengths, weaknesses, and limitations of the study, and suggest future;research directions. Include additional forms of statistical analyses as;part of the suggestions for future research.;The Research Study Critique;1. Must;be three to four double-spaced pages in length (excluding title and reference;pages) and formatted according to APA style as outlined in the Ashford Writing;Center. Use 12-point font, with 1-inch margins.;2. Must;use the sections and headings described above.;3. Must;address the article with critical thought by examining, reflecting, and;evaluating the article from an objective viewpoint and by using facts to;support your argument. Refer to the Critical Thinking Community website for;further assistance.;4. Must;end with a conclusion that summarizes your critical evaluation.;5. Must;use one quantitative research study from a peer-reviewed source that was;published within the last 10 years.;6. Must;properly cite the source article in APA style as outlined in the Ashford Writing;Center.;7. Must;include a separate reference page, formatted according to APA style as outlined;in the Ashford Writing Center.


Paper#61916 | Written in 18-Jul-2015

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