Hi,I have a statistics practice exam (homework) and an exam.The homework has a potential exam questions, if you do it the exam will be easy for you to do. the Homework is duo tomorrow like this time so you have 24hours.The exam will take place at Friday the 23rd of April. The exam is going to be timed 75minutes through Gradescoop portal. can we get a deal on both?
4/15/2021 Submit Stat 216 Practice Exam 2 - S21 | Gradescope https://www.gradescope.com/courses/224306/assignments/1165355/submissions/new 1/25 0/44 Questions Answered Stat 216 Practice Exam 2 - S21 Q1 1 Point This practice exam represents a subset of possible exam questions, and will not cover all possible topics. On questions were you are asked to write things in notation or show mathematical work, you are given the option to EITHER type your answer OR answer on paper, take a picture of your answer, and upload the image. If you will be using the latter option, practice that now to determine the time it takes to complete the picture to upload process, and plan for that during your timed exam. Save Answer Q2 8 Points Researchers have long known that as a person ages, it gets harder for their body to regulate temperature. However, they also want to know if the body temperature does actually decrease as well. The age in years (x) and body temperature in degrees Fahrenheit (y) of 100 blood donors ranging in age from 17 to 84 years old was collected. Below is the linear model output from R for these data. Q2.1 1 Point No file chosenChoose Files No file chosenChoose Files No file chosenChoose Files No file chosenChoose Files No file chosenChoose Files No file chosenChoose Files No file chosenChoose Files No file chosenChoose Files 4/15/2021 Submit Stat 216 Practice Exam 2 - S21 | Gradescope https://www.gradescope.com/courses/224306/assignments/1165355/submissions/new 2/25 Report your estimated line of regression, using proper notation and context. You may either type the notation out (IE pi for or x-bar_d for , or write out your answer on a piece of paper, take a picture of your work, and upload the image here. Enter your answer here Please select file(s) Select file(s) Save Answer Q2.2 1 Point Which of the following is the correct interpretation of the slope coefficient, in the context of the problem? Save Answer Q2.3 1 Point State the null and alternative hypotheses, in notation, to test whether there is a negative linear relationship between a person’s age and their body temperature. Use slope as your statistic. π x d No file chosenChoose Files For every increase in body temperature by 1-degree Fahrenheit, the predicted age decreases by 0.0138. For every one year increase in age, the predicted body temperature increases by 98.6 degrees Fahrenheit. For every increase in age of one year, the predicted body temperature decreases by 0.0138 degrees Fahrenheit. For every increase of one year in age, the predicted body temperature increases by 0.0138 degrees Fahrenheit. No file chosenChoose Files No file chosenChoose Files No file chosenChoose Files No file chosenChoose Files No file chosenChoose Files No file chosenChoose Files No file chosenChoose Files 4/15/2021 Submit Stat 216 Practice Exam 2 - S21 | Gradescope https://www.gradescope.com/courses/224306/assignments/1165355/submissions/new 3/25 You may either type the notation out (IE pi for or x-bar_d for , or write out your answer on a piece of paper, take a picture of your work, and upload the image here. Enter your answer here Please select file(s) Select file(s) Save Answer Q2.4 1 Point Below are the results of a simulation test in R. What is the p-value of the test? p-value (written as a decimal, to four decimal places: Enter your answer here No file chosenChoose Files π x d No file chosenChoose Files No file chosenChoose Files No file chosenChoose Files No file chosenChoose Files No file chosenChoose Files No file chosenChoose Files No file chosenChoose Files 4/15/2021 Submit Stat 216 Practice Exam 2 - S21 | Gradescope https://www.gradescope.com/courses/224306/assignments/1165355/submissions/new 4/25 Save Answer Q2.5 1 Point Fill in the blanks with either a number (#) or one option in each set of parentheses to determine how one sample on the null distribution above was created. On (blank 1: #) cards, write (blank 2: correlation/slope/temperature/age) of each person sampled. (Blank 3: Shuffle/Resample with replacement) the cards. Plot the (Blank 4: shuffled/resampled) data and calculate the new (Blank 5: correlation/slope/mean/proportion) from each simulated sample. Blank 1: Enter your answer here No file chosenChoose Files No file chosenChoose Files No file chosenChoose Files No file chosenChoose Files No file chosenChoose Files No file chosenChoose Files No file chosenChoose Files No file chosenChoose Files 4/15/2021 Submit Stat 216 Practice Exam 2 - S21 | Gradescope https://www.gradescope.com/courses/224306/assignments/1165355/submissions/new 5/25 Blank 2: Enter your answer here Blank 3: Enter your answer here Blank 4: Enter your answer here Blank 5: Enter your answer here Save Answer Q2.6 1 Point Where is the simulated null distribution centered? Explain why you would have anticipated that, in the context of the problem. Center: Enter your answer here Explanation (in context): Enter your answer here Save Answer Q2.7 1 Point No file chosenChoose Files No file chosenChoose Files No file chosenChoose Files No file chosenChoose Files No file chosenChoose Files No file chosenChoose Files No file chosenChoose Files No file chosenChoose Files 4/15/2021 Submit Stat 216 Practice Exam 2 - S21 | Gradescope https://www.gradescope.com/courses/224306/assignments/1165355/submissions/new 6/25 What is your conclusion regarding the researcher’s hypotheses? Enter your answer here Save Answer Q2.8 1 Point Select all of the following ways to increase the power of the test. Save Answer Q3 8 Points Suppose that in a random sample of 500 Bozeman residents, 61% indicated they own a dog, while in a random sample of 500 Missoula residents, 53% indicated they owned a dog. Researchers would like to examine the difference in dog ownership rates between Missoula and Bozeman (Bozeman -Missoula). Q3.1 1 Point Fill in the blanks with one answer in each set of parentheses to correctly describe the study design. No file chosenChoose Files No file chosenChoose Files Increase the probability of a Type I error Increase the sample size Use random assignment Use a two-sided alternative No file chosenChoose Files No file chosenChoose Files No file chosenChoose Files No file chosenChoose Files No file chosenChoose Files No file chosenChoose Files 4/15/2021 Submit Stat 216 Practice Exam 2 - S21 | Gradescope https://www.gradescope.com/courses/224306/assignments/1165355/submissions/new 7/25 This study is a(n) (blank 1: observational study/randomized experiment) because the variable (blank 2: owned a dog or not/city of residence) (blank 3: was/was not) randomly (blank 4: assigned/sampled). Blank 1: Enter your answer here Blank 2: Enter your answer here Blank 3: Enter your answer here Blank 4: Enter your answer here Save Answer Q3.2 1 Point What type of plot should be used to display these data? Save Answer Q3.3 1 Point No file chosenChoose Files No file chosenChoose Files Scatterplot Segmented bar graph Histogram Side-by-side boxplots No file chosenChoose Files No file chosenChoose Files No file chosenChoose Files No file chosenChoose Files No file chosenChoose Files No file chosenChoose Files 4/15/2021 Submit Stat 216 Practice Exam 2 - S21 | Gradescope https://www.gradescope.com/courses/224306/assignments/1165355/submissions/new 8/25 Are the conditions met to analyze these data using a theoretical approach? Answer in the context of the problem and be sure to address all conditions. Enter your answer here Save Answer Q3.4 1 Point Calculate the standard error for a 95% confidence interval for the parameter of interest. Show all work either by typing out your work in the space provided or writing your work on a piece of paper, taking a picture, and uploading the image here. Enter your answer here Please select file(s) Select file(s) Save Answer Q3.5 1 Point Calculate a 95% confidence interval for the true difference in dog ownership between Bozeman and Missoula residents. Use the multiplier of 1.96. Show all work either by typing out your work in the space provided or writing your work on a piece of paper, taking a picture, and uploading the image here. Enter your answer here No file chosenChoose Files No file chosenChoose Files No file chosenChoose Files No file chosenChoose Files No file chosenChoose Files No file chosenChoose Files No file chosenChoose Files No file chosenChoose Files 4/15/2021 Submit Stat 216 Practice Exam 2 - S21 | Gradescope https://www.gradescope.com/courses/224306/assignments/1165355/submissions/new 9/25 Please select file(s) Select file(s) Save Answer Q3.6 1 Point Based on the 95% confidence interval, is there evidence of a difference in dog ownership rates between Missoula and Bozeman? Fill in the blanks with one answer in each set of parentheses to complete your answer. (Blank 1: Yes/No) because the (blank 2: statistic/null value) (blank 3: is/is not) in the confidence interval. Blank 1: Enter your answer here Blank 2: Enter your answer here Blank 3: Enter your answer here Save Answer Q3.7 1 Point A 90% confidence interval for the parameter was calculated as (0.0287, 0.1313). Fill in the blanks with either a number (#) or one option in each set of parentheses to explain what it means to be 90% confident in this interval. No file chosenChoose Files No file chosenChoose Files No file chosenChoose Files No file chosenChoose Files No file chosenChoose Files No file chosenChoose Files No file chosenChoose Files No file chosenChoose Files 4/15/2021 Submit Stat 216 Practice Exam 2 - S21 | Gradescope https://www.gradescope.com/courses/224306/assignments/1165355/submissions/new 10/25 If we were to repeatedly sample, (blank 1: #)% of random samples of this size would create a confidence interval which contains the (blank 2: sample/true) (blank 3: difference in proportions/difference in means/slope or correlation) of (blank 4: dog owners between Bozeman and Missoula/Bozeman residents between dog owners and non-dog- owners). Blank 1: Enter your answer here Blank 2: Enter your answer here Blank 3: Enter your answer here Blank 4: Enter your answer here Save Answer Q3.8 1 Point Fill in the blanks with one answer in each set of parentheses to determine the appropriate scope of inference. We can say that city of residence (blank 1: is associated with/caused) the difference in proportion of dog ownership for (blank 2: all Missoula and Bozeman residents/those similar to this sample). Blank 1: Enter your answer here No file chosenChoose Files No file chosenChoose Files No file chosenChoose Files No file chosenChoose Files No file chosenChoose Files No file chosenChoose Files No file chosenChoose Files No file chosenChoose Files 4/15/2021 Submit Stat 216 Practice Exam 2 - S21 | Gradescope https://www.gradescope.com/courses/224306/assignments/1165355/submissions/new 11/25 Blank 2: Enter your answer here Save Answer Q4 11 Points Is eating breakfast associated with a student’s GPA? To study this research question, a convenience sample of 106 Stat 216 students were asked whether they eat breakfast on a regular basis and what their current cumulative GPA was. All students who were asked responded to the survey. An analysis of the data is shown below. Q4.1 1 Point Select the best descriptor of the variable: GPA. Save Answer No file chosenChoose Files No file chosenChoose Files No file chosenChoose Files No file chosenChoose Files explanatory, categorical response, categorical explanatory, quantitative response, quantitative No file chosenChoose Files No file chosenChoose Files No file chosenChoose Files No