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STAT CH. 9 (FOR ARMODRILLO1)
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Application of Discrete Mathematics and Statistics Techniques
Assignment ObjectivesApply critical thinking to various IT scenarios using discrete mathematics and statistics techniques.Explain why statistics and probability are important elements in IT.Use statistical methods to analyze, evaluate, and recommend performance improvements for systems.Utilize various discrete mathematics, probability, and statistical models to analyze data, present information, and draw inferences.Assignment DescriptionThis data set is a sample of Web server statistics for a computer science department. It contains the following 11 sections of data:Total successful requestsAverage successful requests per dayTotal successful requests for pagesAverage successful requests for pages per dayTotal failed requestsTotal redirected requestsNumber of distinct files requestedNumber of distinct hosts servedCorrupt logfile linesTotal data transferredAverage data transferred per dayWrite an essay of 2–3 pages that contains the following:A complete overview of the data, identifying anomalies in different weeks, and the weeks that the data are not regular.Choose 5 different sections of data, examine these sections, and provide the specific selection process and criteria you used to select this data set.Provide the measures of tendency and dispersion for each of the 5 different sections of data you selected.Provide 1 chart or graph for each of the 5 processed sections. This may be a pie or bar chart or a histogram.Label the chart or graph clearly.Explain why the graph you provided gave a good visual representation of the data.Based on your explanation above, identify some specific advantages why, in general, charts and graphs are important in conveying information in a visual format.Determine the standard deviation and variation for each of the 5 selected sections of data, and explain their importance in statistical analysis of a data set.Based on the tasks you performed in this project, research how statistics are used in information technology (IT), and provide references for your researchYour essay should include proper citation in APA formatting, both in-text, and in reference pages. Include a title page and use 12-point Times New Roman double-spaced font throughout the text.
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UNIT 10 MATH
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Basic Statistics c4
Problems need to include all required steps and answer(s) for full credit. All answers need to be reduced to lowest terms where possible.Answer the following problems showing your work and explaining (or analyzing) your results. Submit your work in a typed Microsoft Word document.1. Choose one design method from the list below. Using your own example, make a list of 2 or 3 advantages and 2 or 3 disadvantages for using the method. (2 pts)· Simple random sampling· Systematic sampling· Stratified sampling· Cluster sampling2. The name of each student in a class is written on a separate card. The cards are placed in a bag. Three names are picked from the bag. Identify which type of sampling is used and why. (2 pts)3. A phone company obtains an alphabetical list of names of homeowners in a city. They select every 25th person from the list until a sample of 100 is obtained. They then call these 100 people to advertise their services. Does this sampling plan result in a random sample? What type of sample is it? Explain. (2 pts)4. The manager of a company wants to investigate job satisfaction among its employees. One morning after a meeting, she talks to all 25 employees who attended. Does this sampling plan result in a random sample? What type of sample is it? Explain. (2 pts)5. An education expert is researching teaching methods and wishes to interview teachers from a particular school district. She randomly selects 10 schools from the district and interviews all of the teachers at the selected schools. Does this sampling plan result in a random sample? What type of sample is it? Explain. (2 pts)6. Fifty-one sophomore, 42 junior, and 55 senior students are selected from classes with 516, 428, and 551 students respectively. Identify which type of sampling is used and explain your reasoning. (2 pts)7. You want to investigate the workplace attitudes concerning new policies that were put into effect. You have funding and support to contact at most 100 people. Choose a design method and discuss the following:· Describe the sample design method you will use and why. (2 pts)· Specify the population and sample group. Will you include everyone who works for the company, certain departments, full or part-time employees, etc.? (2 pts)· Discuss the bias, on the part of both the researcher and participants. (2 pts)8. A local newspaper wanted to gather information about house sales in the area. It distributed 25,000 electronic surveys to its readers asking questions about house sales in the past 6 months. Of the surveys sent out, 3.2% were returned. The results found that 92% of people did not sell their house in the past 6 months and 85% of people would expect a loss if they sold their house. The writer wants to use these results to conclude that the housing market is declining, and we are headed for a recession.· Explain the bias and sampling error in this study. (2 pts)· Should the writer conclude that the housing market is declining based upon this data? (2 pts)· Why or why not? (2 pts)9. A homeowner is getting carpet installed. The installer is charging her for 250 square feet. She thinks this is more than the actual space being carpeted. She asks a second installer to measure the space to confirm her doubt. Write the null hypothesis Ho and the alternative hypothesis Ha. (2 pts)10.Drug A is the usual treatment for depression in graduate students. Pfizer has a new drug, Drug B, that it thinks may be more effective. You have been hired to design the test program. As part of your project briefing, you decide to explain the logic of statistical testing to the people who are going to be working for you.· Write the research hypothesis and the null hypothesis. (2 pts)· Then construct a table like the one below, displaying the outcomes that would constitute Type I and Type II error. (2 pts)· Write a paragraph explaining which error would be more severe, and why. (2 pts)11.Cough-a-Lot children’s cough syrup is supposed to contain 6 ounces of medicine per bottle. However, since the filling machine is not always precise, there can be variation from bottle to bottle. The amounts in the bottles are normally distributed with σ = 0.3 ounces. A quality assurance inspector measures 10 bottles and finds the following (in ounces):5.956.105.986.016.255.855.916.055.885.91Are the results enough evidence to conclude that the bottles are not filled adequately at the labeled amount of 6 ounces per bottle?· State the hypothesis you will test. (2 pts)· Calculate the test statistic. (2 pts)· Find the P-value. (2 pts)· What is the conclusion? (2 pts)12.Calculate a Z score when X = 20, μ = 17, and σ = 3.4. (2 pts)13.Using a standard normal probabilities table, interpret the results for the Z score in Problem 12. (2 pts)14.Your babysitter claims that she is underpaid given the current market. Her hourly wage is $12 per hour. You do some research and discover that the average wage in your area is $14 per hour with a standard deviation of 1.9. Calculate the Z score and use the table to find the standard normal probability. Based on your findings, should you give her a raise? Explain your reasoning as to why or why not. (2 pts)15.Tutor O-Rama claims that their services will raise student SAT math scores at least 50 points. The average score on the math portion of the SAT is μ=350 and σ=35. The 100 students who completed the tutoring program had an average score of 385 points.· Is the students’ average score of 385 points significant at the 5% and 1% levels to support Tutor O-Rama’s claim of at least a 50-point increase in the SAT score? (2 pts)· Is the Tutor O-Rama students’ average score of 385 points significantly different at the 5% and 1% levels from the average score of 350 points on the math portion of the SAT? What conclusion can you make, based on your results, about the effectiveness of Tutor O-Rama’s tutoring? (2 pts)
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Statistics Experts Only – Need APA Write Up/IBM SPSS Software
ANOVA with Repeated MeasuresThis week, you have explored various functions involving ANOVA with repeated measures. In this Application, you will practice using repeated-measures ANOVA.To prepare for this Application:Review Chapter 14 of the Field text and the Web sites listed in the Resources section for a description of the analysis of variance with repeated measures, as well as an example of conducting an analysis of variance with repeated measures using PASW.Review Chapter 5 from the APA manual, “Displaying Results.”Review the media demonstrating the ANOVA with repeated measures.The assignment:Complete Smart Alex’s Task #2 on p. 589 to perform an analysis of variance with repeated measures using the TutorMarks.sav dataset from the Field text. You can follow the steps outlined on pp. 555–565 as a guide.Report your findings in APA format according to the guidelines in the PASW Application Assignment Guidelines handout. The final document should be 2–3 pages long.
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Statistic Help
Please see the attached questions 1-20. Please use the answer sheet provided.
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