Presentation on theme: "Get your calculator! Describing Data"— Presentation transcript:
1 Get your calculator! 3-26-13 Describing Data 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, 39Which number is the lower quartile for this data set? A. 31B. 23C. 18D. 17DWP: 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?
2 A team scored the following number of points in its last eight games: 15, 24, 17, 19, 21, 38, 25, 39Which number is the lower quartile for this data set? A. 31B. 23C. 18D. 17Answer: CFormer EOG Grade 7 Sample Items Goal 4, #2DWP: 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? 437 tiles
3 BOP - A notebook costs $4. 50 plus sales tax BOP - A notebook costs $4.50 plus sales tax. After sales tax, the notebook is $ What is the sales tax rate?A . 6% B. 7% C. 8% D. 9%Check homework
4 VOCABULARYstatistical questionAnticipates variability or differences in the answers given to the pollPopulationOr targetDefined by common characteristics;For example middle school studentsrandom sampleEach member of the target population has an equally likely chance of occurringcategorical dataWhen the categories for the data collected are words; for example: favorite book, current book you are readingnumerical dataWhen the data collected is numbers; for example: how many books did you read this year
5 Data is often collected to make predictions or determine what is happening within agiven group.In order for data to accurately depict a population,The data must be collected from aRANDOM SAMPLE.
7 Below is the data collected from two random samples of 100 students regarding student’sschool lunch preference. Make at least twoinferences based on the results.
8 Name others… Shoe size Birth year Number of books read Classify each of the following as categorical ornumerical (quantitative) data:Birth yearNumber of books readFavorite genre of booksShoe sizeZip codeName others…
9 The two data sets below depict random samples of the management Salaries in two companies. Based on the salaries below which measureOf center will provide the most accurate estimation of the salaries forEach company?
10 Name some ways that data can be organized: Frequency tables,Stem and leaf plotsBar graphsBox plotDot plotHistogramCircle graphLine graphOthers?
11 Once data is organized it can be described by: CENTER - Mean or MedianSPREAD - Range, Interquartile Range and Mean Absolute Deviation (M.A.D)SHAPE-Mound Shape, Skew Right, Skew Left, and Uniform
12 Skewed right -Extreme low valueson the rightMounding orbell shaped
13 Skewed left -extreme low valuesOn the leftUniform