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by: Lempi Koss


Lempi Koss
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Class Notes
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This 5 page Class Notes was uploaded by Lempi Koss on Sunday September 6, 2015. The Class Notes belongs to NSC 309 at University of Texas at Austin taught by Staff in Fall. Since its upload, it has received 46 views. For similar materials see /class/181407/nsc-309-university-of-texas-at-austin in Natural Sciences at University of Texas at Austin.




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Date Created: 09/06/15
Division of Statistics amp Scientific Computation NSC 309 Introduction to Statistics Unique 49310 Spring 2008 Instructor Teaching Assistant Dr Michael J Mahometa Matthew Grady michael mahometa ssc utexas edu mattgrady8 l hotmail com 4714245 Office Hours PAI 304 Office Hours MEZ 2104 Mondays 910 am Tuesdays 1 tam 12pm Wednesdays 3430 pm Thursdays 12pm Blackboard Bb httpcoursesutexasedu nnouncements course handouts lecture notes exam materials grades and discussion boards will be posted on the course blackboard site If you have a question about the course please check Bb before emailing the instructor or the TA Software Excel You need access to a statistical software package to complete your exams in this course We will be showing you how to use Excel to organize data and run basic statistical analyses If you do not have a copy of Excel you can purchase Microsoft Office from the Campus Computer Store Please note that you may use a different statistical package if you wish but the instructor and TA will not be easily able to respond to questions regarding other statistical packages Textbook Intro Stats by DeVeaux Velleman amp Bock at the CoOp Course Description This course is designed to help you learn the introductory descriptive and inferential statistical procedures that are commonly used in research concerning health behavior and attitudes You will learn the assumptions underlying common statistical procedures the types of hypotheses that can be tested by these procedures and the inferences that can be drawn from their results After completing this course you will have developed a sufficient foundation from which you can begin to conduct your own analyses and critically evaluate the statistical analyses of others Classroom Expectations This course emphasizes an understanding of statistics that goes beyond memorization This is accomplished by engaging you in guided learning activities in the classroom purposeful group activities and regular interactions with real data Talking writing and thinking about statistics will help you learn it and most students find that being in class is very valuable We will also use class time to clarify the exam questions share pointers on working with the datasets and discuss strategies for making the exam process smoother and more productive for you Your active participation and attendance are essential and will be rewarded in the final course grade Graded Assignments l have two different goals for you in this class First I want you to learn to ask good questions when you look at data Second I want you to become familiar with the statistical mechanics of crunching numbers For this reason you will be graded on two kinds of assessments Takehome exams that give you time to ask and answer good questions and inclass quizzes that test your ability to apply the statistical techniques I encourage you to make use ofthe Undergraduate Writing Center to ensure that your takehome exams are clearly written Description of Assignments 1 N 0 5 Excel Quiz This quiz will assess your ability to perform some basic skills in Excel You will be given a short dataset and a helpsheet on how to sort and organize data calculate a mean and generate simple analyses The TA will be running two Excel workshops to help you prepare This quiz is preparation for your takehome exams but you can get help from your friends the TAs or myself Submit your quiz via the Bb link by the due date for credit Quizzes There will be seven planned quizzes throughout the semester You must be present for credit You will have about 25 minutes for each quiz You will know the quiz questions in advance they will be drawn from the textbook problems that have been identified as homework The quizzes take the place of graded homework You will be allowed to drop your lowest quiz grade If you are absent on the day of a quiz that counts as your drop TakeHome Exams There will be four takehome exams These exams require you to work with a set of data that I will post on the course website You will be asked to write up your results in the form of a statistical report following the guidelines given to you Takehome exams must be turned in typed and stapled on the day they are due On the day of the exam you will also complete inclass questions at the beginning ofthe period You may use your takehome exam to help you answer these questions If you are late to class you will not receive additional time on the inclass portion of the exam Final Exam The final exam is mandatory It will be multiplechoice and will cover material from the entire semester If you wish you may count your final exam twice by allowing it to substitute for a grade on a previous takehome exam What You Should Know about Absences lf yo due gt If you miss a quiz you will not be able to retake it h lfyou are absent on an exam day you cannot make up the inclass questions P I will not accept late exams in the classroom Schedule an appointment with me and academic penalties will be assessed at that time u have exceptional circumstances or a serious illness you must notify me before a quiz or exam is so that we can discuss your options I am a reasonable person but my decision to accept late work is based heavily on the responsibility you demonstrate in addressing issues like these Academic Honesty Your takehome exams are given to you to complete independently without the assistance of your classmates If you have questions about an exam you are encouraged to seek assistance from the instr uctor or your TA during class or during office hours When it comes to exams you may not seek guidance from your peers and you may not compare your outcomes with your peers Students who violate these expectations can expect to receive a failing grade on the exam and will be reported to the Dea n of Students office for academic dishonesty Upgrade Policy Frequently students want an opportunity at the end of the semester to raise grades that are close to a grade cutoff This course has a specific policy for awarding final grades If you wish you can earn the right to have your final grade determined by a more lenient cutoff The key point here is that this is done before you find yourself in a tight situation We call this our upgrade policy and it involves earning upgrade points over the course ofthe semester Upgrades are interesting statistical questions or exercises that can be answered with a little bit of effort Each upgrade is worth 2 points with a few exceptions If you earn a total of 10 upgrade points that s basically five upgrades then your final grade will be determined using the more lenient cutoffs shown below Upgrade opportunities will be posted on Bb Visit Bb to learn more about them The bottom line this is a good deal Don t pass it up Grading for this Course 30 points Excel Quiz 240 points Quizzes 7 40 points each drop lowest 100 points Exam 1 100 points Exam 2 100 points Exam 3 100 points Exam 4 100 points Final Exam Total Possible Points 770 points Points needed to earn an Cut Off Without Cut Off With Upgrades Upgrades A 90 693 668 B 80 616 591 C 70 539 514 D 60 462 437 Note Grade cutoffs are firm If you miss an A by one point that s unfortunate but it doesn t change the fact that you did not earn an A The upgrades give you an opportunity to make sure you ll have a cushion for your final grade Take care to earn the points you need for the grade you want Regrade Policy We will grade your quizzes and exams very carefully If you thinkthere may be an error in the grading of your quiz or exam however you should bring it to our attention Regrades will only be considered if you submit your quiz or test within ONE WEEK of its return to you For quiz regrades see the TA For exam regrades bring your exam to your instructor during office hours or schedule an appointment Be prepared to discuss what problems you see with the grading Division of Statistics and Scienti c Computation SSC 303 304 305 306 Goals for Students in an Introductory Course What it Means to be Statistically Educated Students should believe and understand why Data beat anecdotes Variability is natural and is also predictable and quantifiable Random sampling allows results of surveys and experiments to be extended to the population from which the sample was taken Random assignment in comparative experiments allows cause and effect conclusions to be drawn Association is not causation Statistical significance does not necessarily imply practical importance especially for studies with large sample sizes Finding no statistically significant difference or relationship does not necessarily mean there is no difference or no relationship in the population especially for studies with small sample sizes Students should recognize Common sources of bias in surveys and experiments How to determine the population to which the results of statistical inference can be extended if any based on how the data were collected How to determine when a cause and effect inference can be drawn from an association based on how the data were collected eg the design ofthe study That words such as normal random and correlation have specific meanings in statistics that may differ from common usage Students should understand the parts of the process through which statistics works to answer questions namely ow to obtain or generate data How to graph the data as a first step in analyzing data and how to know when that s enough to answer the question of interest How to interpret numerical summaries and graphical displays of data both to answer questions and to check conditions in order to use statistical procedures correctly How to make appropriate use of statistical inference How to communicate the results of a statistical analysis Students should understand the basic ideas of statistical inference The concept of a sampling distribution and how it applies to making statistical inferences based on samples of data including the idea of standard error The concept of statistical significance including significance levels and pvalues The concept of confidence interval including the interpretation of confidence level and margin of error Finally students should know ow to interpret statistical results in context How to critique news stories and journal articles that include statistical information including identifying what s missing in the presentation and the flaws in the studies or methods used to generate the information When to call for help from a statistician NSC 309 Course Outline Spring 2008 Class Lessons Date Event Introduction to Course Tues 115 2 Graphing Quantitative Data Thurs 117 3 Central Tendency amp Variability Tues 122 4 Analyzing Categorical Data Thurs 124 Quiz 1 5 Chi Square Tues 129 Excel Quiz 6 Chi Square Thurs 131 7 Experimental Design Tues 25 Quiz 2 8 Exam 1 Thurs 27 Exam 1 9 Experimental Design Tues 212 10 Correlation Thurs 214 11 Introduction to Regression Tues 219 Quiz 3 12 Regression Thurs 221 13 Regression Tues 226 14 Multiple Regression amp residuals Thurs 228 Quiz 4 15 Exam 2 Tues 34 Exam 2 16 Normal Distribution amp zscores Thurs 36 Break 17 Sampling Distribution 1 proportion Tues 318 18 Confidence Intervals 1 proportion Thurs 320 19 Hypothesis Testing 1 proportion Tues 325 Quiz 5 20 HT amp CI 2 proportions Thurs 327 21 HT amp CI 2 proportions Tues 41 22 Inference on Means Overview Thurs 43 Quiz 6 23 Exam 3 Tues 48 Exam 3 24 One Sample TTest Thurs 410 25 Independent TTest Tues 415 26 Dependent TTest Thurs 417 27 ANOVA Tues 422 Quiz 7 28 ANOVA Thurs 424 29 ANOVA Tues 429 30 Exam 4 amp Course Evals Thurs 51 Exam 4 Mandatory Final Exam Monday May 12 200 500 pm Homework to Prepare for Quizzes Quiz1 CH 2 8 10 14 22 CH 4 4 8 14 16 CH 54 68 10 3032 Qui22 CH 3 6 8 18 2438 CH 26 4 8 12 22 26 Quiz3 CH 1261214 1828 CH 13 2 4 26 32 40 CH 74 6 12 2226 Quiz4 CH 8 2 4 14 20 3642 CH 9 121416 18 QuizS CH 6 6 10 22 30 3240 CH 18 2 10 22 26 CH 19 6 12 14 22 24 QuizG CH 2024 12 1629 CH 21 6 8 14 18 20 24 CH 22 6 12 20 24 28 Quiz7 CH 23 2 8 16 18 26 34 CH 24 2 4 6 14 16 26 CH 25 4 8 14 18 2O


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