Exercise 9 1. A farmer wanted to find the relationship between the amount of fertilizer used and the yield of corn. He selected seven acres of his land on which he used different amounts of fertilizer to grow corn. The following table gives the amount of fertilizer (in pounds) used and the yield of corn (in bushels)for each of the seven acres. Fertilizer Used (x) 120 80 100 70 88 75 110 Yield of Corn(y) 138 112 129 96 119 104 134 a. Find the least squares regression line. a. Calculate r and r2
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Expectations‚ Variances & Covariances The Rules of Summation n å xi ¼ x1 þ x2 þ Á Á Á þ xn covðX; YÞ ¼ E½ðXÀE½XÞðYÀE½YÞ i¼1 n ¼ å å ½x À EðXÞ½ y À EðYÞ f ðx; yÞ å a ¼ na x y i¼1 n covðX;YÞ r ¼ pffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffi varðXÞvarðYÞ n å axi ¼ a å xi i¼1 n i¼1 n n i¼1 i¼1 E(c1X þ c2Y ) ¼ c1E(X ) þ c2E(Y ) E(X þ Y ) ¼ E(X ) þ E(Y ) å ðxi þ yi Þ ¼ å xi þ å yi i¼1 n n n i¼1 i¼1 å ðaxi þ byi Þ ¼ a å xi þ b å yi i¼1 n var(aX þ bY þ cZ ) ¼ a2var(X) þ b2var(Y ) þ c2var(Z
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Statistics in Business Quantitative Analysis for Business University of Phoenix Tanya Bailey April 22‚ 2013 Statistics can sometimes be difficult for some individuals. Understanding the concept of statistics‚ which is known as the science of data‚ may help a person in the business world. This involves classifying‚ summarizing‚ analyzing‚ collecting‚ and interpreting numerical information. The information gathered from statistics can help startup companies‚ and even
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Managerial Statistics (ENMGT 572) Group Assignment You are permitted to use SPSS to solve the following problems unless otherwise stated. Problem 1: Refer to the data file Executive salary.xls. This files shows annual salary of CEOs for various companies and industries. The random variable of interest for this exercise is Sum97. This is the CEO’s annual salary plus bonuses for the year 1997 (referred to as salary here-in). The purpose of this exercise is to determine if there is a significant
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Two-Variable Inequality (YOUR NAME HERE) MAT 221 (YOUR PROFESSOR ’S NAME HERE) February 10‚ 2014 Two-Variable Inequality We use inequalities when there is a range of possible answers for a situation. That’s what we are interested in when we study inequalities‚ possibilities. We can explore the possibilities of an inequality using a number line which is sufficient in simple situations‚ such as inequalities with just one variable. But in more complicated circumstances‚ like those with two variables
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ECMT1010 BUSINESS AND ECONOMIC STATISTICS A ASSIGNMENT Semester 1‚ 2011 This assignment is worth 10% of your total mark. It must be handed in by 4:30pm on Friday‚ 3 June in the marked drop-off boxes in the Merewether building (Level 2‚ reception area). Late assignments will not be accepted and will result in a zero mark. The assignment must be done individually and plagiarism will result in severe penalty and possibly a zero mark. The assignment will be marked out of 50. Marks
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Group 2 BOCK INVESTMENT SERVICES The goal of Bock Investment Services (BIS) is to be the leading money market advisory service in South Carolina. To provide better service for their present clients and to attract new clients. BIS developed a weekly newsletter. BIS is considering adding a new feature to the newsletter that will report the results of a weekly telephone survey of fund managers. To investigate the feasibility of offering this service‚ and to determine what type of information
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A point estimation is a sample statistic that gives a good guess about a population parameter. In the same way‚ a point estimate of the mean overpayment is simply a good guess about what the average overpayment for the population is. Investigating all 1‚000 claims and obtaining the overpayment amount for each would either be impractical‚ unfeasible or both. Thus‚ the auditor deems a sample size of 50 claims to be adequate and sufficiently representative of the entire population. The mean overpayment
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STATISTICAL PROCESS CONTROL Prof.S.BHADKUMBHE College Of Engg‚ Manjari(BK) Hadapsar‚ Pune-412 307 N.B.KANCHAN College Of Engg‚ Manjari(BK) Hadapsar‚ Pune-412 307 S.HAGAVANE College Of Engg‚ Manjari(BK) Hadapsar‚ Pune-412 307 S.HIPPERKAR College Of Engg‚ Manjari(BK) Hadapsar‚ Pune-412 307 P.BANAGE College Of Engg‚ Manjari(BK) Hadapsar‚ Pune-412 307 Email: nilesh29.uk@gmail
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Individual Measurements Cumulative-Sum control charts Control Charts for Large Sample . . Statistical Process Control - Part II IE 330‚ Spring 2013‚ Instructor: Yu-Ching Lee March 14‚ 2013 1 / 127 Process Capability Assessment Control Charts for Individual Measurements Cumulative-Sum control charts Control Charts for Large Sample Use of the histogram Process Capability Indices Statistical Assignment of Tolerances Loss Function Approach . Process Capability Recall that we compared
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