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COURSE SCHEDULE- Week 3 2/3-2/6 2/03 Measuring Spread: Range, IQR, outliers, 5 number summary, mean absolute deviation and standard deviation. How to find above values, what do they measure and when to report what. (Changing variables by adding or multiplying by a constant and their effect on the measures of center and spread) Pre-class homework assignment for 2/06/03: (2) Read : ActivStats Lesson 6- Comparing groups 6.1.3 Do Quiz! 6.2.1 Learn to create boxplots and summary statistics for the Rat Lifetime data. What kind of boxplots have you created y by x or side by side? 6.2.2 Answer the questions: (1)What are the medians? (2)IQR's? (3)Why is a boxplot a particularly good way to compare these groups?(4) What percentage of the RSD rats lived longer than the ALD rats? (5)Approximately what percentage of ALD rats lived longer than 900 days? (6)Approximately what percentage of RSD rats lived longer than 900 days? (7)Can you say that at least half of the ALD rats died sooner than 600 days? (8) Can you say that at least 25% of the RSD group lived longer than 1200 days? 6.2.3 In each step record your answers to the questions. Step 1-2 has three questions, and Step 4 has one question. Also record the name of the outlier in Step 2. 2/06 Lesson 6 : Comparing groups Pre-class assignment for 2/10: (1) 5.1.1 This is the first appearance of a mathematical model in our course. Record the information in the summary. Make sure to understand that density curves are mathematical models NOT part of reality!!! They are used to model histograms that on the other hand do record real data. (2) 5.1.2. What do we use density curves for? Record the numerical answers to Study Questions 1-4! (3) 5.1.3 Do Quiz! (4) Read ActivStats 4.4.3 Yes, no mistake, go back to Chapter 4. Standardizing. How does standardizing change the shape, the mean and the standard deviation of a distribution? (5) 5.2.1 Where do you find the mean and standard deviation of a normal density on its graph? What is the empirical rule? What will be the mean and standard deviation of a normal density after standardizing ? (6) 5.2..2 Quiz (7) 5.2.3 How does the normal probability plot of a normally distributed variable look like? How can you draw a normal probability plot in Data Desk? Group Homework Due 2/17: Part (1) Lesson-6 ACT 1, MBS-1, MRB-1, MRB-3, RMW-1,WEN-3 Part II. Each group has to bring to class a simple example of the use of statistics in newspapers. You will show and describe the example in class. Make sure to pick something that you understand. Be prepared to answer the W questions, note if the answer is missing to any that could be a possible source of bias. Comment on how reliable the information seems to you.