Problems on Regression and Correlation Prepared by: Dr. Elias Dabeet Q1. Dr. Green (a pediatrician) wanted to test if there is a correlation between the number of meals consumed by a child per day (X) and the child weight (Y). Included you will find a table containing the information on 5 of the children. Use the table to answer the following: Child Number of meals consumed per day (X) child weight (Y) X² Y² XY Ahmad 11 8 121 64 88 Ali 16 11 256 121 176 Osama 12 9 144
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Chapter 10 (Unit 8): Quality Control Learning Objective: * Learning Objectives: 1. List and briefly explain the elements in the control process 2. Explain how control charts are used to monitor a process‚ and the concepts that underlie their use 3. Use and interpret control charts 4. Perform run tests to check for nonrandomness in process output 5. Assess process capability * What is Quality Control? 6. A process that evaluates output relative to
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Accounting Research Center‚ Booth School of Business‚ University of Chicago Who Is My Peer? A Valuation-Based Approach to the Selection of Comparable Firms Author(s): Sanjeev Bhojraj and Charles M. C. Lee Source: Journal of Accounting Research‚ Vol. 40‚ No. 2‚ Studies on Accounting‚ Entrepreneurship and E-Commerce (May‚ 2002)‚ pp. 407-439 Published by: Blackwell Publishing on behalf of Accounting Research Center‚ Booth School of Business‚ University of Chicago Stable URL: http://www.jstor.org/stable/3542390
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mental ability (GMA) and Ihe 18 other selection procedures. Overall‚ the 3 combinations with the highest multivariate validity and utility for job performance were GMA plus a work sample test (mean validity of .63)‚ GMA plus an integrity test (mean validity of .65)‚ and GMA plus a structured interview (mean validity of .63). A further advantage of the latter 2 combinations is that they can be used for both entry level selection and selection of experienced employees. The practical utility implications
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Efficiency Our analysis of efficiency was primarily concerned with finding any marked differences between staff undertaking the same tasks. We found that; * For jobs assigned a low-level or mid-level difficulty there was negligible difference in mean time between Mechanics. * For Higher-level difficulty jobs‚ there were more noticeable differences between each Mechanic. However‚ this is most likely due to errors relating to the system used in assigning difficulties. * There was no obvious
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Question4: What closing time should Citywide Spirits Shoppe choose to maximize profits? Through the Attachment: (Evening time) Contribution Margin = average purchase revenue-average purchase cost = $30.52-$23.25 = $7.27 per customer per purchase Average numbers of customer: (Attachment 2) close time averge customers Time Total customer 10pm 10.18 10pm~11pm 12 11pm 10.16 10pm~12pm 21 12pm 10.08 10pm~1am 27 1am 9.71 10pm~2am 32 2am 9.4 10pm~3am 36 3am 9.06 10pm~4am
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Causes‚ findings and recommendations on absenteeism among students One of the most annoying‚ if unavoidable experiences of teachers like me is dealing with student absenteeism. We prepare lesson plans with the objective that 100% of the class will learn from the day’s classroom activities. And it is most satisfying when all students are present on that day and the days thereafter to ensure maximum learning. Sadly‚ it is very difficult to achieve a perfect attendance among my students.No matter
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of the various cereals. The raw data (sugar content and serving size) was obtained from the nutritional content label located on the side of each box of cereal. Median: The median is 11.82 grams of sugar per serving. (7.5+16.13=23.63/2) Sample Mean: 13.50 grams of sugar per serving (134.96/10= sum of the sugars‚ divided by the sample size) Range: 26.18 (27.78-1.6) Difference between the maximum and minimum Sample Variance: 86.49866667 (Calculation shown on the next page: used a spreadsheet
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Listening Skills Careful listening can increase your telephone efficiency. The average speaking rate is 150 to 160 words a minute‚ but we can think at 600 words a minute which means that only twenty five percent of our mental capacity is required to record what is being said. By using the rest to think about and react to the words instead of thinking about other distractions‚ we would improve our listening by gathering more information from what is being said. To let the other person know
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The Springville Herald Case SH2.1 Type of Error Total Percent Copy Error 54 16.9 Layout 7 2.2 Omits 13 4.1 Paste-up 11 3.4 Poor reproduction 8 2.5 Ran-in error 30 9.4 Rate quote 13 4.1 Space not needed 7 2.2 Typesetting 53 16.6 Velox 28 8.8 Wrong ad 25 7.8 Wrong date 14 4.4 Wrong position 45 14.1 Wrong manual paste-up 5 1.6 Wrong size
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