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This 3 page Class Notes was uploaded by Uriah MacGyver on Saturday September 19, 2015. The Class Notes belongs to STAT200 at University of Delaware taught by Staff in Fall. Since its upload, it has received 37 views. For similar materials see /class/207187/stat200-university-of-delaware in Statistics at University of Delaware.
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Date Created: 09/19/15
STAT 200 Exercise 1 1 Read the following material and discuss the major implications of misleading data and answer the questions that follow Did you ever notice that no matter where you stand on a popular issues of the day you can always nd statistics to back up your point of view whether to take vitamins whether day care harms kids or what foods can hurt you or save you There is an endless ow of information to help you make decisions but is this information accurate unbiased John Stossel decided to check that out and you might be surprised to learn if the picture you re getting doesn t seem quite right maybe it isn t Barbara Walters gave this introduction to a March 31 1995 segment of the popular prime time ABC television program 20l20 The story is titled Facts or Fiction Expos s of So Called Surveys One of the surveys investigated by ABC correspondent John Stossel compared the discipline problems experienced by teachers in the 1940s and those experienced today The results In the 1940s teachers worried most about students talking in class chewing gum and running in the halls Today they worry most about being assaulted This information was highly publicized in the print media daily newspapers weekly magazines Landers column The Congressional Quarterly and the Wall Street Journal among others and referenced in speeches by avariety of public figures includingthe former first lady Barbara Bush and former Education Secretary William Bennett Hearing this made me yearn for the old days when life was so much simpler and gentler but was that life that simple then asks Stossel Wasn t there juvenile delinquency in the 1940s Isthe survey true With the help of a Yale School of Management Professor Stossel found the original source of the teacher survey Texas oilman T Colin Davis and discovered it wasn t a survey at all Davis had simply identified certain disciplinary problems encountered by teachers and published his list in a conservative newsletter a list he admitted was not obtained from a statistical survey but from Davis personal knowledge ofthe problems in the 1940s I was in school then and his understanding of the problems today I read the papers Stossel s commonsense questions of the teacher survey is a clear example of the critical thinking process in action Several more misleading surveys were presented on the ABC A 2020 View of Survey Results Fact or Fiction program Listed here most of these surveys were conducted by businesses or special interest groups with specific objectives in mind The 20l20 segment ended with an interview onynthia Crossen authorof Tainted Truth an exposes of misleading and biased surveys Crossen warns lf everybody is misusing numbers and scaring us with numbers to get us to do something however good that something is we ve lost the power of numbers Now we know certain things from research For example we know that smoking cigarettes is hard on your lungs an heart and because we know that many people s lives have been extended or saved We don t want to lose the power of information to help us make decisions and that s what I worry about a How do you feel about surveys and statistics from research Do you trust them Do you answer surveys b Can you think of a recent surveys or research result on the news that gave you pause or concern What were you concerns or doubts about the results To help you might think of a recent health study report or a public opinion poll on politics public policy or how the President is doing c Do you agree with the concern of Cynthia Crossen on the danger of misuse of numbers see the box Do you think statistics are misused today How can we guard against misuse 2 A group of University of South Florida surgery researchers believe that the drug aprotinin is effective in reducing the blood loss of burn patients who undergo skin replacement surgery In a clinical trial of 14 burn patients half were randomly assigned to receive the drug and half a placebo no drug An analysis of the data show that the group with the patients blood loss revealed that the group with the drug had a significant reduction in bleeding a identify the data collection method for this study b Does the study involve descriptive or inferential statistics c What is the populationor sample of interest to the researchers 3 The following data are average SAT scores in 1999 by state and the District of Columbia 51 observations For the Average State Verbal scores 2quot column aCmMmdaSbmwdm Pmdmmwywmdmemm m mw mhbmw b Calculate the mean median and mode and put your answers in the box on the right State Verbal 479 482 487 493 494 494 495 496 497 498 498 499 503 504 507 507 508 510 511 512 514 516 520 524 525 525 527 534 536 542 545 546 547 549 557 559 561 561 563 563 567 568 569 570 572 578 584 585 586 594 594 h ath 475 513 482 493 478 499 502 498 514 510 495 498 497 499 507 503 499 509 511 517 506 514 518 525 525 526 512 568 540 540 546 551 547 542 565 553 555 558 556 548 560 571 585 568 572 576 595 588 598 598 605 Total 954 995 969 986 972 993 997 994 1011 1008 993 997 1000 1003 1014 1010 1007 1019 1022 1029 1020 1030 1038 1049 1050 1051 1039 1102 1076 1082 1091 1097 1094 1091 1122 1112 1116 1119 1119 1111 1127 1139 1154 1138 1144 1154 1179 1173 1184 1192 1199 6 A U39IU39ILOAVLOOOU39INOOOOAO Sum the total of all data points Mean the sum divided by the number of observations Median the mlddle ofthe data in this case the 26m data point Mode the most common data value
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