i need answer for the 4 questions mentioned above .

NPTEL : COU X NPTEL : Mar X SaveFrom.ne X New Tab X Downloads X G business stat X Business Sta X G seitz corpora X CASE SEITZ ( X Course Hero X + X -> C @ Not secure | fac.ksu.edu.sa/sites/default/files/business-statistics-for-contemporary-decision-making-by-ken-black_0.pdf S Business Statistics 428 /906 398 Chapter 10 Statistical Inferences about Two Populations from this year's files and determined that the mean sales per customer for this sample was $2,450, with a standard Two-Sample T-Test and CI: 2008, 2009 deviation of $540. Analyze these data and summarize Two-sample T for 2008 vs 2009 your findings for managers. Explain how this information N Mean StDev SE Mean can be used by decision makers. Assume that sales per 2008 75 6 . 466 0. 352 0 . 041 customer are normally distributed. 2009 93 6. 604 0. 398 0 . 041 2. One common approach to measuring a company's quality Difference = mu (2008) - mu (2009) is through the use of customer satisfaction surveys. Estimate for difference: -0.1376 Suppose in a random sample, Seitz's customers are asked 95% CI for difference: (-0.2535, -0. 0217) whether the plastic tractor produced by Seitz has out- T-Test of difference = 0 (vs not = 0) : standing quality ( Yes or No). Assume Seitz produces these T-Value = -2. 34 P-Value = 0.020 DF = 166 tractors at two different plant locations and that the tractor Both use Pooled StDev = 0. 3782 customers can be divided according to where their trac- tors were manufactured. Suppose a random sample of 4. Suppose Seitz produces pulleys that are specified to be 50 45 customers who bought tractors made at plant 1 results millimeters (mm) in diameter. A large batch of pulleys is in 18 saying the tractors have excellent quality and a ran- made in week 1 and another is made in week 5. Quality dom sample of 51 customers who bought tractors made control people want to determine whether there is a differ- at plant 2 results in 12 saying the tractors have excellent ence in the variance of the diameters of the two batches. quality. Use a confidence interval to express the estimated Assume that a sample of six pulleys from the week 1 batch difference in population proportions of excellent ratings results in the following diameter measurements (in mm): between the two groups of customers. Does it seem to 51, 50, 48, 50, 49, 51. Assume that a sample of seven pulleys matter which plant produces the tractors in terms of the from the week 5 batch results in the following diameter quality rating received from customers? What would you measurements (in mm): 50, 48, 48, 51, 52, 50, 52. Conduct report from these data? a test to determine whether the variance in diameters dif- 3. Suppose the customer satisfaction survey included a fers between these two populations. Why would the quality question on the overall quality of Seitz measured on a control people be interested in such a test? What results of scale from 0 to 10 where higher numbers indicate greater this test would you relate to them? What about the means quality. Company managers monitor the figures from of these two batches? Analyze these data in terms of the year to year to help determine whether Seitz is improving means and report on the results. Assume that pulley diam- customers' perceptions of its quality. Suppose random eters are normally distributed in the population. samples of the responses from 2008 customers and 2009 customers are taken and analyzed on this question, and Source: Adapted from "Seitz Corporation," Strengthening America's Compet- the following Minitab analysis of the data results. Help itiveness: Resource Management Insights for Small Business Success," published managers interpret this analysis so that comparisons can by Warner Books on behalf of Connecticut Mutual Life Insurance Company be made between 2008 and 2009. Discuss the samples, the and the U.S. Chamber of Commerce in association with the Blue Chip statistics, and the conclusions. Enterprise Initiative, 1991. Case update based on Seitz Corporation, http:// www.seitzcorp.com/about.htm O Type here to search e 9 ? ~ [) ENG 5:18 PM 8/31/2019NPTEL : COU X NPTEL : Mar X SaveFrom.ne X New Tab X Downloads X G business stat X Business Sta X G seitz corpora X CASE SEITZ ( X Course Hero X + X C @ Not secure | fac.ksu.edu.sa/sites/default/files/business-statistics-for-contemporary-decision-making-by-ken-black_0.pdf S Business Statistics 427 /906 CASE SEITZ CORPORATION: PRODUCING QUALITY GEAR-DRIVEN AND LINEAR-MOTION PRODUCTS The Seitz Corporation, a QS 9000 certified organization based in Once the program started, thousands of dollars in cost sav- Torrington, Connecticut, is a leading designer and manufacturer ings and two new products generating almost $1 million in of thermoplastic motion control systems and components and sales resulted. Annual sales grew from $10.8 million in 1987 to an industry leader in plastics and gear trains. Founded in 1949 $19 million in 1990. Seitz's customer base expanded from 312 by the late Karl F. Seitz, the company began as a small tool-making in 1987 to 550 at the end of 1990. business and grew slowly. In the late 1960s, the company In the decade of the 1990s, Seitz continued its steady expanded its services to include custom injection molding. As growth. By 1999, Seitz was shipping products to 28 countries, their customer base grew to include leading printer manufacturers, Seitz developed and patented a proprietary line of perforated- and customers included Xerox, Hewlett Packard, Canon, U.S. form handling tractors. Utilizing its injection-molding technol- Tsubaki, and many more worldwide. By 1998, sales topped the $30 million mark. In January 2000, the company established ogy, the company engineered an all-plastic tractor called Data Motion, which replaced costly metal versions. By the late 1970s, the Seitz Motion Control Systems Co., Lid., in Changzhou, China, about 150 miles northwest of Shanghai, to provide business was booming, and Data Motion had become the world- product and tooling design engineering, sourcing and supply wide industry leader. chain management services, and contract manufacturing. The In the 1980s, foreign competition entered the business Seitz Corporation headquarters is located in Torrington, equipment market, and many of Seitz's customers relocated or Connecticut in an 80,000 square foot facility with over 150 closed shop. The ripple effect hit Seitz as sales declined and associates, 50 molding machines ranging in size from 35 tons profits eroded. Employment at the company dropped from a to 770 tons, an in-house tooling department, and a corporate high of 313 in 1985 to only 125 in 1987. Drastic changes had staff. While the primary core competency of the Seitz to be made at Seitz. Corporation is rotary and linear motion control, making them To meet the challenge in 1987, Seitz made a crucial decision an industry leader in plastics and gear trains, Seitz offers a full to change the way it did business. The company implemented range of product design and tooling services. a formal five-year plan with measurable goals called "World- Class Excellence Through Total Quality." Senior managers Discussion devoted many hours to improving employee training and 1. Seitz's list of several hundred business-to-business cus- involvement. New concepts were explored and integrated into tomers continues to grow. Managers would like to know the business plan. Teams and programs were put into place to whether the average dollar amount of sales per transac- immediately correct deficiencies in Seitz's systems that were tion per customer has changed from last year to this year. revealed in customer satisfaction surveys. All employees from Suppose company accountants sampled 20 customers + machine operators to accountants were taught that quality randomly from last year's records and determined that means understanding customers' needs and fulfilling them the mean sales per customer was $2,300, with a standard correctly the first time. deviation of $500. They sampled 25 customers randomly O Type here to search 0 9 ? ~ [)) ENG 5:18 PM 8/31/2019