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Words 1419

Pages 6

(b) What does a correlation coefficient reveal?

Correlation coefficient reveals the degree of association between independent and dependent variables. The closer to the one the value is the more strong relationship. Negative values means negative relationship with r=-1 as perfect negative relationship whereas positive values means positive association with perfect positive association as r=1.

(c) State the quick rule for a significant correlation and explain its limitations.

r=1 means perfect positive relationship r=-1 means perfect negative relationship r=0 means no relationship

Limitations are with respect to its subjectivity because r slightly greater than 0.5 may be treated as good relationship whereas r slightly less than 0.5 may have opposite meaning.

(d) What sums are needed to calculate a correlation coefficient?

Sums required are:

1) −(−)

2) (−)2

3) (−)2

(e) What are the two ways of testing a correlation coefficient for significance?

Two methods are:

1) t-test: The test statistic is:=−21−2

2) z-test: Test statistic is:=ln[+1−1]2

12.48 In the following regression, X = weekly pay, Y = income tax withheld, and n = 35 McDonald’s employees.

(a) Write the fitted regression equation.

The regression equation is:

=30.7963+0.0343

(b) State the degrees of freedom for a two tailed test for zero slope, and use Appendix D to find the critical value at α = .05.

(c) The degrees of freedom as shown in the output is 33

The critical value at =0.05 is 2.035

(d) What is your conclusion about the slope?

The t-statistic…...

...Week 1- Problem 8.48 A sample of 20 pages was taken without replacement from the 1,591-page phone directory Ameritech Pages Plus Yellow Pages. On each page, the mean area devoted to display ads was measured (a display ad is a large block of multicolored illustrations, maps, and text). The data (in square millimeters) are shown below:0 260 356 403 536 0 268 369 428 536 268 396 469 536 162 338 403 536 536 130(a) Construct a 95 percent confidence interval for the true mean. (b) Why might normality be an issue here? (c) What sample size would be needed to obtain an error of ±10 square millimeters with 99 percent confidence? (d) If this is not a reasonable requirement, suggest one that is. (Data are from a project by MBA student Daniel R. Dalach.) Sample mean = x-bar = 346.5 The sample standard deviation is s = 170.38 t-value for dof = 20 – 1 = 19 on a two-tailed test with = 0.05 is 2.093 Margin of error = 2.093 * [170.38/Ö20]= 79.74 (a) 95% C.I. is [346.5 – 79.74, 346.5 + 79.74] = [266.76, 426.24] (b) The C.I. is a statement about the population. The sample of 20 might not have been randomly selected from the whole population. Moreover, the data is not continuous. There are 2 zeroes. (c) Here, ± 10 = 2.575 * 170.38/Ön On solving, we get n = 1925 (d) 99% confidence is too tight for a distribution that is probably not normal. Reducing it to a, say, 90% confidence would reduce the required sample size. Problem 8.64 Biting an unpopped kernel of......

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...that the meaning of the text lies in discovering the meaning of Goodman Brown's encounter in the woods. The story begins with Goodman Brown leaving his wife, Faith for an overnight errand. She begs him not to go, but he does so anyway. Faith is the only symbol of hope in the story. She is a symbolic of love, as in the love between man and woman, and also the love, faith and devotion he has in God. In essence, by leaving Faith in the beginning of the story, he is leaving his faith in God and good. Faith is introduced in the beginning of the story as the devoted wife who warns her husband to stay with her because of a dream that she has. http://www.sparknotes.com/short-stories/young-goodman-brown/ http://classiclit.about.com/library/bl-etexts/nhawthorne/bl-nhaw-goodman.htm http://voices.yahoo.com/symbolism-human-nature-nathaniel-hawthornes-30790.html http://bcs.bedfordstmartins.com/virtualit/fiction/criticaldefine/psychessay.pdf http://www.enotes.com/young-goodman-brown...

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...ASSIGNMENTS ARE TO BE COMPLETED PRIOR TO THE WEEK IN THAT THEY APPEAR. [pic] [pic] DIRECTED STUDY AND ONLINE ALL ASSIGNMENTS ARE TO BE COMPLETED DURING THE WEEK IN THAT THEY APPEAR. Student Materials COURSE MATERIALS The materials for this course are electronic and are found on the CMGT 410 rEsourceSM page. Software Microsoft Project® Other MATERIALS “Project Overview,” (NOTE: This material is found in the back of the module.) Week One Project Management and the Organization • Define Project Life Cycle. • Identify roles in project management. • Identify project manager's skills. • Demonstrate project management software. ASSIGNMENTS [pic] ALL DELIVERY METHODS 1. READ SECTION ONE IN THE ETEXT. 2. Read articles for Week One. 3. Complete Unit 1, Microsoft Project 2000 Fundamentals in the NETg Training Library. [pic] CLASSROOM 1. READ THE FOLLOWING ITEMS, AVAILABLE AT HTTP://ECAMPUS.PHOENIX.EDU: a. “Learning Team Charter” b. “Directions for Completing Learning Team Log” c. “Learning Team Log” d. “Directions for Completing the Learning Summary” e. “Learning Summary” 2. Select Learning Team members who will work together throughout the course. 3. Suggest an appropriate Learning Team Meeting location. [pic] ONLINE 1. SUBMIT YOUR WEEKLY SUMMARY FOR THIS WEEK AS INSTRUCTED IN THE COURSE SYLLABUS PROVIDED BY YOUR INSTRUCTOR. 2. Select Learning Team members who will work together throughout......

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...heavy textbook * High quality screens for graphics * Apple introduced iTextbooks * Offers a few txt in iBookstore * Interactive and convenient for students to purchase * Studycards – flashcards * Offers 5 books from McGraw Hill and 2 from Pearson * Customer value proposition of traditional text format – traditional texts valued more amongst students (highlight; notes; sell back; rent; etc) * Customer valuation etext – less expensive; convenience access anywhere * Profit formulas * Traditional: Retailer accounting for 50% sell price, author royalties for 15%; printing costs for 10% of sellig price and publisher profits for an additional 10% sell price * Major value chain cost difference b/t traditional and extect was printing cost made up only 10% final price * eText: e-retailers received 30% of price of lower priced etexts; publisher received other 70% of sell price but paid 25% of rev to authors as royalties; authors received 17.5% of sell price of etext compared to 15% sell price of traditional text 2. Platforms g. Way for publishers to make virtual texts more appealing to both professors and students h. Interactive online software encourage professor to use their product instead of a competitor’s i. Generally included: interactive online homework “lab”, tutorials, quizzes j. McGraw Hill’s version – Connect i. Allowed professors to pick and choose from options......

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...Real Estate Data sets this data will be used to determine if there is a difference in the mean price per square foot among homes with different number of homes with and without garages (Doane & Seward, 2007). Explain which nonparametric test you used to analyze your data and why you chose that test. The Wald-Wolfowitz one- sample run nonparametric test is used in this data set to give the purchases of homes in the order they are purchased. Why this test is used ? This is so the understanding of the outcome of the frequency of a certain variables References Doane, D. P. & Seward, L. E. (2007). Applied statistics in business and Economics .Boston, MA: McGraw-Hill/Irwin .Retrieved on April 08, 2011 from University of Phoenix RES342 –Course Material web-site Dohrmann B, (2011) Economics Recovery Risks Retrieved on April 8, 2011 from http://theceospaceblog.com/ Rosales L. (2011) Despite Recession, Some Cities are recovering well: Pockets of good news Retrieved on April 08, 2011 from http://agentgenius.com/real-estate-news-events/despite-recession-some-cities-are- recovering-well/...

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...the relationship between the Native Americans was unstable and hard the Puritans were devoted to prayer and God. They each carried high value in letting God be their guide. They trusted in him to carry out any conflicts or situations in the New World and their time spent with the Indians. Works Cited Works Cited PBS. God in America . 11 October 2010. http://www.pbs.org/godinamerica/people/puritans.html Rowlandson, Mary. “A Narrative of the Captivity and Restoration of Mrs. Mary Rowlandson.” The American Tradition in Literature. Vol. 2, 12th ed. Eds. George Perkins and Barbara Perkins. Boston: McGraw Hill. Creat eText. http://create.mcgraw-hill.com. Bradford, William. “Of Plymouth Plantation Book I, Book II.” The American Tradition in Literature. Vol. 2, 12th ed. Eds. George Perkins and Barbara Perkins. Boston: McGraw Hill. Creat eText. http://create.mcgraw-hill.com....

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...given (University of Phoenix, 2011). For example, increasing the knowledge of the software engineers and providing additional training would boost their competency and productivity (University of Phoenix, 2011). The results of the simulation pointed-out factors that would help businesses increase their achievement goals. Productivity and Client satisfaction were the two most important variables recognized in this simulation (University of Phoenix). Knowing these tools and addressing them properly can make a difficult situation less difficult to handle. Reference University of Phoenix. (2011). Applying Analysis of Variance (ANOVA) Nonparametric Tests Simulation. Retrieved from University of Phoenix, Simulation, RES342-Research and Evaluation course website....

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...E text exercise 8.48 A sample of 20 pages was taken without replacement from the 1,591-page phone directory Ameritech Pages Plus Yellow Pages. On each page, the mean area devoted to display ads was measured (a display ad is a large block of multicolored illustrations, maps, and text). The data (insquare millimeters) are shown below: 0 260 356 403 536 0 268 369 428 536 268 396 469 536 162 338 403 536 536 130 (a) Construct a 95 percent confidence interval for the true mean. (b) Why might normality be an issue here? (c) What sample size would be needed to obtain an error of ?}10 square millimeters with 99 percent confidence? (d) If this is not a reasonable requirement, suggest one that is. (Data are from a project by MBA student Daniel R. Dalach.) My answer: A) 95% confidence level for a true mean: Degrees of freedom: n-1 = 20-1 = 19 t= 2.093 Lower Limit = xbar – t(s/√n) 346.5-2.093 (170.38/ √20) =266.76 Upper limit= xbar + t(s/√n) =346.5+ 2.093(170.38 /√20) =462.24 B) There could be an issue because the area is between both the upper and lower limit. C) n= (zs/E)^2 n= (2.5758*170.38/10)^2 n=1926.02 D) A lower limit would be more appropriate. 8.64 Biting an unpopped kernel of popcorn hurts! As an experiment, a self-confessed connoisseur of cheap popcorn carefully counted 773 kernels and put them in a......

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...control, did not immediately abolish slavery. But it made emancipation an irrevocable war aim, profoundly changing the character of the Civil War. Even before Abraham Lincoln issued the Emancipation Proclamation, thousands of slaves fled to freedom behind the lines of the Union army as it advanced into Confederate territory. In his last public speech, shortly before his death in April 1865, President Lincoln endorsed the idea of limited black suffrage, singling out army veterans, along with the educated, as most worthy. Bibliography Berkin, Carol, Christopher L. Miller, Robert W. Cherny, and James L. Gormly. Making America: A History of the United States. 417 Ibid, 418 Ibid, 419 Ibid, 420 Ibid, 421 "Pearson EText Sign In Page." Pearson EText Sign In Page. Accessed May 06, 2016. Ibid, 571 Ibid, 573 Ibid, 607 Ibid, 636 Ibid, 641 Ross-Nazzal, “Reconstruction, America’s Unfinished Revolution, 1865-1877”, slide 2. Bibliography Berkin, Carol. Making America. Ross-Nazzal. Reconstruction, America’s Unfinished Revolution, 1865-1877 ...

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...Hypothesis Identification Danielle Rickards RES342 February 13, 2012 Dean Gualco Hypothesis Identification Algae are considered versatile in nature since it has much potential. Algae can be used for multiple purposes including food, bio-filters, industrial fuels and compounds, etc. It seems as though the more research conducted on algae, the more functions that are found. Recently more research studies have been conducted on the uses of algae. “Algae, being one of the widely cultivated species around the world, have been a focus of many research studies to widen its commercial scope”(, 2012, ). Since algae are freely available, the use of algae in any industry could help reduce cost and increase profitability. One of the recent research studies was composed by a team from the School of Architecture and the Built Environment of Singapore Polytechnic. The team was focused on the use of algae in the construction industry. Algae from the catchment areas of water bodies are known for its binding ability. The team used this binding ability of algae for the development of a bio-based binding structure. The team’s hypothesis was that by adding the wet algae to conventional cement, the mixture could be used in the construction industry. Not only would the use of algae reduce the cost of construction but also reduce the toxic alkaline components of the conventional cement, which causes lung and skin disorders. The team determined that combining 40% of the wet algae with 60% of...

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...8.48 A sample of 20 pages was taken without replacement from the 1,591-page phone directory Ameritech Pages Plus Yellow Pages. On each page, the mean area devoted to display ads was measured (a display ad is a large block of multicolored illustrations, maps, and text). The data (in square millimeters) are shown below: 0 260 356 403 536 0 268 369 428 536 268 396 469 536 162 338 403 536 536 130 (a) Construct a 95 percent confidence interval for the true mean. (b) Why might normality be an issue here? (c) What sample size would be needed to obtain an error of ±10 square millimeters with 99 percent confidence? (d) If this is not a reasonable requirement, suggest one that is. (Data are from a project by MBA student Daniel R. Dalach.) DisplayAds 8.64 Biting an unpopped kernel of popcorn hurts! As an experiment, a self-confessed connoisseur of cheap popcorn carefully counted 773 kernels and put them in a popper. After popping, the unpopped kernels were counted. There were 86. (a) Construct a 90 percent confidence interval for the proportion of all kernels that would not pop. (b) Check the normality assumption. (c) Try the Very Quick Rule. Does it work well here? Why, or why not? (d) Why might this sample not be typical? (a) Construct a 90 percent confidence interval for the proportion of all kernels that would not pop. p-hat = 86/773 = 0.1113 ------- E = 1.96*sqrt[0.1113*0.8887/773] = 0.0221 -------- CI = (0.1113-0.0221 ,......

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...Course Description This course integrates applied business research and descriptive statistics. Examination of the role of statistics in research, statistical terminology, the appropriate use of statistical techniques and interpretation of statistical findings in business and research will be the primary focus. Policies Faculty and students/learners will be held responsible for understanding and adhering to all policies contained within the following two documents: • University policies: You must be logged into the student website to view this document. • Instructor policies: This document is posted in the Course Materials forum. University policies are subject to change. Be sure to read the policies at the beginning of each class. Policies may be slightly different depending on the modality in which you attend class. If you have recently changed modalities, read the policies governing your current class modality. Course Materials Doane, D. P. & Seward, L. E. (2007). Applied statistics in business and economics. Boston, MA: McGraw-Hill/Irwin. Supplemental Resource Orris, J. B. (2007). Basic statistics using Excel and MegaStat. Boston MA: McGraw-Hill/Irwin. All electronic materials are available on the student website. Week One: One Sample Hypothesis Testing Details Due Points Objectives 1.1 Identify the formal hypothesis testing process. 1.2 Perform a hypothesis test of one proportion. 1.3 Perform a hypothesis test of one population mean...

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...Week 3 E-Text Chauntilena Goodwin RES/342 May 1, 2012 Olivia Scott Week 3 E-Text 10.30 In Dallas, some fire trucks were painted yellow (instead of red) to heighten their visibility. During a test period, the fleet of red fire trucks made 153,348 runs and had 20 accidents, while the fleet of yellow fire trucks made 135,035 runs and had 4 accidents. At α = .01, did the yellow fire trucks have a significantly lower accident rate? (a) State the hypotheses. H0: p1 ≥ p2 H1: p1 < p2 (b) State the decision rule and sketch it. Reject the null hypothesis if the critical value is less than z.010= -2.326 and the p-value is greater than .01. (c) Find the sample proportions and z test statistic. P1 = 4135,035 = .00002962 p2 = 20153,348 = .00013042 P = x1+ x2n1+ n2 = 4+20135,035+153,348 = .00008322 z.010 = P1-P2p1-P[1n1+1n2] = .00002962-.00013042.000083221-.0000832[1135,035+1153,348] = -2.9610 (d) Make a decision. Since the z.010 < -2.326 the decision is to reject the null hypothesis (e) Find the p-value and interpret it. P (z<-2.9610) = .0015. The probabilities of a z-score lower than -2.9610 is only .0015. (f ) If statistically significant, do you think the difference is large enough to be important? If so, to whom, and why? The difference of statistical significant is important so that the fire department can have information that can lower cost and make operation safer. (g) Is the normality assumption fulfilled? Explain. The sample size is......

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...MGT/307 Week Four Organizational Characteristics and Processes INTRODUCTION We will study the elements and effects of technology and organizational power this week. You will learn about how technology has impacted the workplace and how the distribution of power can positively or negatively affect the overall productivity of the workplace. Most companies rely heavily on technology to assist in accomplishing their goals. The use of technology has rapidly increased in the past two decades. This has allowed companies to do business across increased distances at lightening speed. Such dramatic change in the workplace leads to increased stress as the workforce struggles to keep pace with technological advances. Week in Relation to the Course So far we have examined how individuals come together to form groups and teams in the workplace. We have also learned about the various human characteristics that add to organizational productivity. It is also important to understand the tools that assist the workforce in reaching their goals. Technology is the most ubiquitous method today for allowing people and organizations to gain and maintain the competitive edge. Knowledge is power in today’s competitive business world and technology provides the power necessary to maximize business capabilities. Of course, with the use of technology and power, difficulty arises. This week allows us to learn about how we can effectively use technology while understanding and minimizing the......

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...Cumulative Bank Services and Balance In the world of banking, it is often speculated that the more accounts and services a client holds with a particular financial institution, the longer they will stay with that bank. The idea is, the more accounts they open for each client, the more dependent these clients will become to their services, and closing several accounts to join another institution requires time and effort. Avoiding these tedious tasks will manipulate a client to stay with the given financial institution longer as well as prompting them to maintain majority of their funds under the same roof. There are many studies conducted to prove this scenario that is the reason why the “cross-selling” technique has been adopted by the banking industries. The ultimate goal is clear, and all financial institutions believe that “those who die with the most money win”. Whether or not these techniques create a false sense of loyalty, the question is: Does account balance exhibit any correlation to the number of services a client holds with the bank? Numbers don’t lie, we will explore and evaluate this hypothesis using statistics and data sets from Century National Bank to prove whether or not this idea holds true. Hypothesis Statement “Does account balance exhibit any correlation to the number of services a client holds with the bank?" The banking industry as a whole has changed over the past decade in which customer are able to use technology to update account information,......

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