Exam+1+take+home+Questions+Highlighted

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Rutgers University *

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0822

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Psychology

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Dec 6, 2023

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Uploaded by samuelm2022

Page 1 of 13 Statistics for Psychology-Exam 1-take home-Due Monday October 16 th at 4pm This exam should be completed on your own. Working together with anyone to complete these questions is cheating and is in violation of Temple University’s Academic Honesty Policy. See page 14 of the syllabus. If you cheat on this exam you will receive zero points and will be referred to the University Disciplinary Committee for further action. Below are the questions you need to answer for Exam 1-take home. There are 45 questions and 70 total points. The multiple choice questions are graded automatically and are 28 out of the 70 points. So the score you will see right away is out of 28 points.   Some of the following questions will require hand calculations and some will require you to use Jamovi. Hand calculations For some questions, you will be required to conduct hand calculations. Be sure to show ALL of your work otherwise you cannot earn any points. Additionally, be sure to use the formulas that are being taught in this course (i.e., the definitional formulas) otherwise you cannot earn any points. Refer to the PowerPoints for these formulas. Jamovi For other questions, you will be required to copy/paste the Jamovi output into an acceptable file type and upload that file to Canvas. Generate only what is best/appropriate. Points will be taken off for unnecessary/inappropriate numbers. For the uploads of hand calculations, drawings of distributions, and the copy/pasted Jamovi output, acceptable files types are a Word document, a Google doc, PDF, or jpg/jpeg/png. You will not be given another opportunity to upload files so ensure you have reviewed page 5 of the syllabus for acceptable file types.    Do not upload HEIC files. These cannot be reliably accessed in order to check your work and give you feedback. Please ensure that these are ready to upload before you begin the quiz because you only get one attempt for this assignment. You will complete this exam in Canvas. Go to Quizzes (or Assignments), then Exam 1-take home-submit answers. This is the only way to submit the take home exam for points.   You only have one attempt for this exam so please ensure that you know how you want to answer the questions before you open the exam in Canvas.

Page 2 of 13 Questions 1-3. A drink vendor randomly asked college students which product they had consumed most often during the past month: 13 said water, 5 said seltzer, 12 said juice, and 20 said cola. 1. Using Jamovi, make a frequency table and upload this output. Please ensure that these are ready to upload before you begin the quiz because you only get one attempt for this assignment. See the instructions for this assignment and page 5 of the syllabus for acceptable file types and other information. If you choose, you can put all of your work for this entire assignment on the same document. If you do that, just upload that same document for all of the questions requiring a file upload. Be sure that your answers are labeled/organized and legible. Points will be taken off otherwise. 2. Using Jamovi, make the appropriate chart for the data. Please ensure that these are ready to upload before you begin the quiz because you only get one attempt for this assignment. See the instructions for this assignment and page 5 of the syllabus for acceptable file types and other information. If you choose, you can put all of your work for this entire assignment on the same document. If you do that, just upload that same document for all of the questions requiring a file upload. Be sure that your answers are labeled/organized and legible. Points will be taken off otherwise. 3. Explain why you chose the chart you did in Question 2.

Page 3 of 13 Questions 4 and 5. A psychologist interested in people's response to art had seven people indicate their liking for a particular piece of sculpture on a scale from 0-20. Higher scores mean more liking. Their ratings on this 0-20 scale for the participants were: 2 17 19 18 16 18 19 4. Using Jamovi compute the best measure of central tendency and upload this output. Please ensure that these are ready to upload before you begin the quiz because you only get one attempt for this assignment. See the instructions for this assignment and page 5 of the syllabus for acceptable file types and other information. If you choose, you can put all of your work for this entire assignment on the same document. If you do that, just upload that same document for all of the questions requiring a file upload. Be sure that your answers are labeled/organized and legible. Points will be taken off otherwise. 5. Explain why you chose the measure of central tendency that you did in Question 4.

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Page 4 of 13 Questions 6-10. A concierge is interested in how long it takes to bring passengers to the airport and then return to the hotel. The round-trip travel times for six taxi drivers were: 45 minutes 30 minutes 42 minutes 45 minutes 41 minutes 43 minutes 6. What is the mean of this data? a. 6.40 b. 41 c. 49.20 d. 246 7. What is the variance of this data? a. 5.13 b. 26.33 c. 31.60 d. 158 8. What is the standard deviation of this data? a. 5.13 b. 5.62 c. 26.33 d. 31.60 9. Upload your work for the hand calculations of the mean, variance, and standard deviation (i.e., the previous three questions). Be sure to show ALL of your work and be sure to use the formulas that are being taught in this course (i.e., the definitional formulas). Refer to the PowerPoints for these formulas. Otherwise you cannot earn any points. Please ensure that these are ready to upload before you begin the quiz because you only get one attempt for this assignment. See the instructions for this assignment and page 5 of the syllabus for acceptable file types and other information. If you choose, you can put all of your work for this entire assignment on the same document. If you do that, just upload that same document for all of the questions requiring a file upload. Be sure that your answers are labeled/organized and legible. Points will be taken off otherwise.

Page 5 of 13 10. Explain how you calculated the variance and standard deviation. Detail the process (i.e., the steps) in calculating these statistics. Do not just list equations. In your explanation, be sure to use the names of the concepts. For example, if you are calculating a deviation score, use that specific term. Do not simply say “that number.” Lastly, be sure to address both measures of variability. 11. Explain why standard deviation is more often used as a descriptive statistic than variance.

Page 6 of 13 Questions 12-15. A developmental psychologist was interested in how long it would take a particular 7-year-old child to complete three different aptitude tests as compared with 7-year-olds in the general population. The child's time for reading was 31 minutes (μ = 29, σ = 4). For math, it was 26 minutes (μ = 32, σ = 2). For science, it was 40 minutes (μ = 31, σ = 4). 12. Use Jamovi to answer the following question: What is the child’s best score? a. reading b. math c. science d. the three scores are equally good 13. Use Jamovi to answer the following question: What is the child’s worst score? a. reading b. math c. science d. the three scores are equally bad 14. Explain how you know the answers to Questions 12 and 13. 15. Take a screenshot(s) of Jamovi showing HOW you calculated the scores for reading, math, and science. Be sure it shows how you calculated these scores and not just that they were calculated. Lastly, be sure all of the scores are shown. Copy/paste the Jamovi output into an acceptable file type and upload that file to Canvas. Please ensure that these are ready to upload before you begin the quiz because you only get one attempt for this assignment. See the instructions for this assignment and page 5 of the syllabus for acceptable file types and other information. If you choose, you can put all of your work for this entire assignment on the same document. If you do that, just upload that same document for all of the questions requiring a file upload. Be sure that your answers are labeled/organized and legible. Points will be taken off otherwise.

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Page 7 of 13 Questions 16-18. On a test of marital intimacy, husbands' scores are normally distributed with a mean of 140 and a standard deviation of 25. Note that for these questions you will not be required to upload your work because you can use the 50%-34%-14%-2% figure. 16. Using the 50%-34%-14%-2% figure, approximately what percentage of husbands have scores above 190? a. 2% b. 14% c. 16% d. 50% 17. Using the 50%-34%-14%-2% figure, approximately what percentage of husbands have scores below 165? a. 16% b. 50% c. 84% d. 98% 18. Using the 50%-34%-14%-2% figure, approximately what percentage of husbands have scores below 115? a. 2% b. 14% c. 16% d. 84%

Page 8 of 13 Questions 19-21. The number of words in the active vocabulary of children of a particular age is normally distributed with a mean of 3000 and a standard deviation of 500. Note that for these questions you will not be required to upload your work because you will be using the Normal Curve Table. You can find this table in the textbook (pages 671-674) or on Canvas (go to Modules, then Tables, then Normal Curve Table). 19. Using the Normal Curve Table, determine the score a child needs to have to be among the top 5%. a. +0.13 b. -0.13 c. +1.645 d. -1.645 20. Using the Normal Curve Table, determine the score a child needs to have to be among the top 20%. a. +0.52 b. -0.52 c. +0.84 d. -0.84 21. Using the Normal Curve Table, determine the score a child needs to have to be among the bottom 10% a. +1.28 b. -1.28 c. +0.25 d. -0.25

Page 9 of 13 Questions 22-33. A music magazine has determined that the average length of a pop song on the radio is 3.75 minutes with a standard deviation of 0.75 minutes. A randomly selected rock song is 5 minutes. Using the .05 level of significance, is the length of rock songs longer than pop songs in general? 22. What is the null hypothesis? a. Rock songs are longer than pop songs in general b. Rock songs are shorter than pop songs in general c. Rock songs are the same length as pop songs in general d. Rock songs are a different length than pop songs in general 23. Explain why you chose the answer you did in Question 22. 24. What is the research hypothesis? a. Rock songs are longer than pop songs in general b. Rock songs are shorter than pop songs in general c. Rock songs are the same length as pop songs in general d. Rock songs are a different length than pop songs in general 25. What is the comparison distribution mean? a. .05 b. 0.75 c. 3.75 d. 5 26. What is the comparison distribution standard deviation? a. .05 b. 0.75 c. 3.75 d. 5 27. What is/are the cutoff(s)? a. +1.64 b. -1.64 c. +1.96 d. -1.96 28. What is the z-score for the sample score? a. .05 b. +1.67 c. 5 d. -1.67

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Page 10 of 13 29. Explain how you calculated your answer for Question 28. Detail the process do not just list equations. In your explanation, be sure to use the names of the concepts. For example, if you are calculating a deviation score, use that specific term. Do not simply say “that number”. 30. Upload your work for the hand calculation from Question 28. Be sure to show ALL of your work otherwise you cannot earn any points. Additionally, be sure to use the formulas that are being taught in this course (i.e., the definitional formulas). Refer to the PowerPoints for these formulas. Otherwise you cannot earn any points. Please ensure that these are ready to upload before you begin the quiz because you only get one attempt for this assignment. See the instructions for this assignment and page 5 of the syllabus for acceptable file types and other information. If you choose, you can put all of your work for this entire assignment on the same document. If you do that, just upload that same document for all of the questions requiring a file upload. Be sure that your answers are labeled/organized and legible. Points will be taken off otherwise. 31. Upload a sketch for this hypothesis test showing: a) the cutoff(s) b) the rejection region(s) c) the sample z-score Please ensure that these are ready to upload before you begin the quiz because you only get one attempt for this assignment. See the instructions for this assignment and page 5 of the syllabus for acceptable file types and other information. If you choose, you can put all of your work for this entire assignment on the same document. If you do that, just upload that same document for all of the questions requiring a file upload. Be sure that your answers are labeled/organized and legible. Points will be taken off otherwise. 32. What is your conclusion for this hypothesis test? a. reject the null b. accept the research hypothesis c. accept the null d. fail to reject the null 33. Provide an interpretation of your findings for this hypothesis test. An interpretation is a one sentence conclusion of the hypothesis test that should be free of statistical jargon.

Page 11 of 13 Questions 34-45. A nutritionist wants to determine whether people who regularly drink one protein shake per day have different cholesterol levels than people in general. In the general population, cholesterol is normally distributed with μ = 190 and σ = 30. A person follow ed the protein shake regimen for two months and his cholesterol is 155. Use the 1% significance level to test the nutritionist’s idea. 34. What is the null hypothesis? a. The person who followed the protein shake regimen will have lower cholesterol levels than those who are not on the protein shake regimen b. The person who followed the protein shake regimen will have higher cholesterol levels than those who are not on the protein shake regimen c. The person who followed the protein shake regimen will have a different cholesterol level than those who are not on the protein shake regimen d. The person who followed the protein shake regimen will have the same cholesterol levels as those who are not on the protein shake regimen 35. What is the research hypothesis? a. The person who followed the protein shake regimen will have lower cholesterol levels than those who are not on the protein shake regimen b. The person who followed the protein shake regimen will have higher cholesterol levels than those who are not on the protein shake regimen c. The person who followed the protein shake regimen will have a different cholesterol level than those who are not on the protein shake regimen d. The person who followed the protein shake regimen will have the same cholesterol levels as those who are not on the protein shake regimen 36. Explain why you chose the answer you did in Question 35. 37. What is the comparison distribution mean? a. 30 b. 155 c. 190 d. .01

Page 12 of 13 38. What is the comparison distribution standard deviation? a. 30 b. 155 c. 190 d. .01 39. What is/are the cutoff(s)? a. +1.64 b. ±1.96 c. +2.33 d. ±2.58 40. What is the z-score for the sample score? a. -1.17 b. +1.17 c. .01 d. 155 41. Upload your work for the hand calculation from Question 40. Be sure to show ALL of your work otherwise you cannot earn any points. Additionally, be sure to use the formulas that are being taught in this course (i.e., the definitional formulas). Refer to the PowerPoints for these formulas. Otherwise you cannot earn any points. Please ensure that these are ready to upload before you begin the quiz because you only get one attempt for this assignment. See the instructions for this assignment and page 5 of the syllabus for acceptable file types and other information. If you choose, you can put all of your work for this entire assignment on the same document. If you do that, just upload that same document for all of the questions requiring a file upload. Be sure that your answers are labeled/organized and legible. Points will be taken off otherwise.

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Page 13 of 13 42. Upload a sketch for this hypothesis test showing: a) the cutoff(s) b) the rejection region(s) c) the sample z-score Please ensure that these are ready to upload before you begin the quiz because you only get one attempt for this assignment. See the instructions for this assignment and page 5 of the syllabus for acceptable file types and other information. If you choose, you can put all of your work for this entire assignment on the same document. If you do that, just upload that same document for all of the questions requiring a file upload. Be sure that your answers are labeled/organized and legible. Points will be taken off otherwise. 43. What is your conclusion for this hypothesis test? a. reject the null b. accept the research hypothesis c. accept the null d. fail to reject the null 44. Explain why you chose the answer you did in Question 43. 45. Provide an interpretation of your findings for this hypothesis test. An interpretation is a one sentence conclusion of the hypothesis test that should be free of statistical jargon

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