Inferential Statistics (z-tests and t-tests)

Instructions

7a. Jackson (2012) even-numbered questions in Chapter 8 (p. 75)7b. After you complete the textbook readings, check your understanding of the main concepts by reviewing the chapter review questions in the attached PowerPoint files. Be sure to revisit appropriate sections of the textbook if you find that you need more review. While these questions are not graded, they are important because they will help you to monitor your learning as you progress through the course.1. Chapter 8 PowerPoint.ppsReview the videos provided in order to review the important concepts that are explored in this assignment.Application Questions and Problems7c. Download Week 7 Exercises and complete the problems and questions as presented. Show your work (either your hand calculations or your statistical program output). You can either scan your work to submit it as a low-resolution graphic, and then type your answers directly into the document, or cut and paste your work into a Word file. Be sure to name the file using the proper Northcentral naming conventions before its submittal.

Answer

Chapter EightProblem 1)Mean = Total time spent Number of studentsMean= 18+7+10+13+12+16+5+20+21=13.6 hours 9Problem 2)Mean-64.6, sample size-100, Std dev-1.9 if mean -63, sample 100, Z-score?Z=63-64.6 =1.6 =-8.42 1.9 0.19 /100Z-score; -0.84Problem 3) p=110-66=44 = 40 % 110Meaning 40% of the teachers have no doctorate, thus in a population of 349 those without doctorate will be 349 * 0.4= 140 those with no doctorate = 1404)e =z *sd square root (n)square root(n)= 2.16 *16/ 20 = 1.7285) = 4/8= 0.5 28 (1.96) (0.5) = 27.02 28 + (1.96) (0.5) = 28.98=27.02 to 28.986)margin of error = z*s/square root(n) n= [z* s/margin of error] ^2n= {1.96 *70000/10000} ^2= [1.96*7] ^2=189= 189 homesProblem 7)e= z*[sqrt(p*q)/n]=1.96 *[sqrt (0.33*0.67)] 490= 1.96*{sqrt (0.00045)}=1.96*0.021=1.981Chapter NineProbl...
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