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Unformatted text preview: STA 100 Lecture 7 Paul Baines Department of Statistics University of California, Davis January 19th, 2011 Admin for the Day I Homework 2 due today I No homework for next week I Midterm next Wednesday, Jan 26th, in class I Friday will be a midterm review session I No office hours for Prof. Baines on Friday I Extra office hours next week, Mon+Tues (stay tuned) References for Today: Rosner, Ch 4.14.9 (7th Ed.) References for Friday: None (Midterm Review) Quiz Feedback 1. The lower quartile of a dataset is: (a) A value that 25% of the data is less than or equal to (b) The 25th percentile (c) Both of (a) and (b) (d) Neither of (a) and (b) Quiz Feedback 2. You have data on the diameter of lots of trees in a forest (in cm): 46.0, 93.4, ... . You want to understand the data, so you would: (a) Make a histogram of the data, a boxplot is inappropriate (b) Make a boxplot of the data, a histogram is inappropriate (c) Neither a histogram or a boxplot are appropriate here (d) Plot both. A histogram and a boxplot are both useful here Quiz Feedback 3. The goal of most statistical analyses is to: (a) Use population quantities to make statements about the sample (b) Estimate population quantities using data from a sample (c) Estimate the properties of a sample (d) Look at differences between the sample and population Quiz Feedback 4. Your friend has 10 data points, the smallest of which is 13.3 and the largest of which is 63.3. One of the following four statements is true. Which is it? (a) The standard deviation is 51.0, the mean is 36.7. (b) The standard deviation is 12.0, the mean is 36.7. (c) The standard deviation is 12.0, the mean is 13.4. (d) It could be any of the above. Results Remember, these quizzes are a learning tool, not a test! Most credit will come from just taking the quiz (and the fraction of the overall grade is small). Lets see how you did. . . Quiz Answers a b c d Answers to Q1 0.0 0.2 0.4 0.6 0.8 1.0 a b c d Answers to Q2 0.0 0.2 0.4 0.6 0.8 1.0 a b c d Answers to Q3 0.0 0.2 0.4 0.6 0.8 1.0 a b c d Answers to Q4 0.0 0.2 0.4 0.6 0.8 1.0 Quiz Scores 1 2 3 4 Quiz 1 Scores 0.0 0.2 0.4 0.6 0.8 1.0 Morals of the Story 1. Median, Quartiles and Percentiles are connected (Median=50th Percentile, Lower Quartile=25th Percentile, Upper Quantile=75th Percentile) 2. Plots are exploratory no wrong plots (just ones that dont help much) 3. The population is our goal, we use our sample to get at this 4. Standard deviation is related to the range of the data (rule of thumb: SD Range/5)....
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This note was uploaded on 01/17/2012 for the course STAT 100 taught by Professor drake during the Fall '10 term at UC Davis.
 Fall '10
 DRAKE
 Statistics

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