I have added all instructions as a file.
ERMA7310 - Midterm Examination ERMA7310 - Midterm Examination Spring 2022 Directions: 1. You will have almost one weeks to complete this examination. 2. You may use your notes, homework examples, code files from class, your textbook, other statistical references, and your personal knowledge. You may NOT consult other students or faculty members. 3. If you have questions or need clarification, contact me by email at
[email protected]. Please type the following pledge at the beginning of your narrative document and type your name after it as your signature if you comply with this pledge. If you do not include this pledge, your exam may be returned to you ungraded. On my honor as a student, I have neither given nor received aid on this examination outside the scope of the directions. To Complete this assignment you would submit one or two on documents on Canvas. Either: 1. A R code script with the code used to prepare variables, tables, and graphs. (.R) 2. A text or word processing document with the narrative and any relevant tables and graphs (e.g. .docx, .pdf, .html). This document should stand alone, meaning that all relevant statistics and other information should be included in tables or graphs within this document. Or: 1. An html file with the R code and text write up in the same document. This document should include all the content mentioned above. DO NOT TURN IN A Lname_midterm.Rmd FILE For each document use the following naming convention, Lname_midterm.suffix where Lname is your capitalized last name, and suffix is the relevant suffix (.R, .html, .docx). For example, if I were turning in homework, I could include the following files: Murrah_midterm.R Murrah_midterm.docx Or Murrah_midterm.html NOTE: the text or Word document should be self-contained. That means all the output needed for the arguments made must also be in this document. It is NOT sufficient to refer to the R code script. 1
[email protected] Questions I. (100 points) Hypnosis is a viable strategy for reducing experienced pain in patients. There is also evidence the the more susceptible patients are to suggestion, the greater the effect of hypnosis. However, there is also variability in the level of hypnosis attained with patients. The purpose of this study is, first to estimate the relation between hypnosis and pain controling for level of susceptibility to suggestion, and second to determine if susceptibility of suggestion explains variance in experienced pain above and beyond level of hypnosis attained. A randomly selected sample of college students participated in the study; their data follow. You can import the data from the pain.csv file linked in the exam. Table 1: Pain Study Data id pain hypnosis susceptibility 1 29 8 4 2 22 5 3 3 37 9 5 4 33 4 2 5 41 8 4 6 32 6 3 7 42 9 5 8 28 6 2 9 18 3 1 10 38 7 3 11 22 4 4 12 30 7 5 13 38 9 4 14 34 5 3 15 27 4 2 16 28 7 4 Guiding questions: The following questions should guide your write up. BUT THE WRITE UP SHOULD BE FORMAT- TED AS A VERY ABBREVIATED MANUSCRIPT. It should look like the examples given in class. Do not include the question followed by the answers. a. Generate a concise table with descriptive statistics for the important variables in the data set. b. Generate a concise correlation table for the important variables in the data set. c. Determine the regression model (equation) in raw score form. Include the estimated equation for each and provide your interpretation for the meaning of the regression coefficients. d. Evaluate the overall fit of the model using the multiple R2 and the corresponding statistical test, and explain the meaning of this test. Explain the R2 as an effect size measure. e. Determine if both predictors are meaningful in the regression model. Be sure to discuss effect size and tests of the regression coefficients. Explain your results. f. Check the data for assumptions, outliers, and influential cases. Write a brief paragraph summarizing what you found. g. Interpret these results and how they are related to the original research question. 2 Directions: Questions I. (100 points) Guiding questions: