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## 3-26-13 Describing Data

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**3-26-13 Describing Data**Get your calculator! EQ: How would you describe real-world data using the median or mode as a measure of center, and range as a measure of variability? How would you describe a data distribution? BOP - A team scored the following number of points in its last eight games: 15, 24, 17, 19, 21, 38, 25, 39 Which number is the lower quartile for this data set?A. 31 B. 23 C. 18 D. 17 DWP: A kitchen is shaped like a rectangle with dimensions of 11 ½ by 9 ½ ft. The floor of the room is made of square tiles with a side length of ½ ft. What is the number of tiles that will cover the kitchen floor?**A team scored the following number of points in its last**eight games: 15, 24, 17, 19, 21, 38, 25, 39 Which number is the lower quartile for this data set?A. 31 B. 23 C. 18 D. 17 Answer: C Former EOG Grade 7 Sample Items Goal 4, #2 DWP: A kitchen is shaped like a rectangle with dimensions of 11 ½ by 9 ½ ft. The floor of the room is made of square tiles with a side length of ½ ft. What is the number of tiles that will cover the kitchen floor? 437tiles**BOP - A notebook costs $4.50 plus sales tax. After sales**tax, the notebook is $4.86. What is the sales tax rate? A . 6% B. 7% C. 8% D. 9% Check homework**Data is often collected to make predictions or**determine what is happening within a given group. In order for data to accurately depict a population, The data must be collected from a RANDOM SAMPLE.**Below is the data collected from two random**samples of 100 students regarding student’s school lunch preference. Make at least two inferences based on the results.**Classify each of the following as categorical or**numerical (quantitative) data: Birth year Number of books read Favorite genre of books Shoe size Zip code Name others…**The two data sets below depict random samples of the**management Salaries in two companies. Based on the salaries below which measure Of center will provide the most accurate estimation of the salaries for Each company?**Name some ways that data**can be organized: Frequency tables, Stem and leaf plots Bar graphs Box plot Dot plot Histogram Circle graph Line graph Others?**Once data is organized it can be described by:**CENTER - Mean or Median SPREAD- Range, Interquartile Range and Mean Absolute Deviation (M.A.D) SHAPE-Mound Shape, Skew Right, Skew Left, and Uniform**Skewed right -**Extreme low values on the right Mounding or bell shaped**Skewed left -**extreme low values On the left Uniform**Work on review handout.**Finish for homework.**EXIT ACTIVITY:**3 - Name three things you have learned about data and statistics 2 - Name two things you are still unsure about. 1 - Name one thing you want to learn more about.