1. 1.Please have out your HOMEWORK to be stamped. 2.SECRET CODE MAD will be collected. 3.Complete through Pythagorean Theorem on your SKILL BUILDER NOW! x ft

3. TUESDAY 1.Which statement is true in describing the mean absolute deviation for a data set? A The mean absolute deviation is the absolute value of the mean of the data set. B The mean absolute deviation is the average distance each data point is from the median of the data set. C The mean absolute deviation is the average distance each data point is from the mode of the data set. D The mean absolute deviation is the average distance each data point is from the mean of the data set. 2. Ms. Grace keeps track of the number of books read by each reading group in her class. What is the mean absolute deviation? 3. Greta made a graph of the points scored during the first 7 games of the season. What is the mean absolute deviation of the data, rounded to the nearest tenth? F 2.6 G 3.2 H 7.1 J 9.7 20+30+30+45+45+45+50 = 265 7 Mean = 38 18+8+8+7+7+7+12= 67 7 MAD 9.6 4+8+8+10+10+12+16 = 68 7 Mean = 9.7 5.7+1.7+1.7+0.3+0.3+2.3+6.3 = 18.3 7

4. A scatterplot is a type of graph that uses plotted points to show patterns in bivariate data. Source: http://en.wikipedia.org/wiki/File:Oldfaithful3.png x-axis Title y-axis Labels points Source: http://pdphoto.org/PictureDetail.php?mat=pdef&pg=5274

5. A correlation is an association between quantities. Features of correlation: Linearity – linear or nonlinear Strength – strong or weak Slope – positive or negative

6. Linearity LinearForms a straight line NonlinearDoes NOT form a straight line Strength StrongPoints are close together WeakPoints are far apart Slope positiveAs x increases, y increases negativeAs x increases, y decreases No pattern means no correlation.

7. Missing Assignments (x) 0112041 Report Card Grade (y) 81746759933670 Linearity: Linear Strength: Strong Slope: Negative Summary: Students with more missing assignments tend to have lower report card grades

8. Side Length (x) 12345 Volume (y) 182764125 Side Length and Volume of a Cube Linearity: Nonlinear Strength: Strong Slope: Positive Summary: The volume of a cube increases rapidly as its side length increases

9. Hours Worked (x) 12345566 Earnings (y) 2550245010015090115 Linearity: Linear Strength: Weak Slope: Positive Summary: In general, people who work more hours earn more money

10. Pets Owned (x) 001122233 Height in Inches (y) 686163667060656267 No Correlation Summary: There does not appear to be a correlation between the number of pets a student owns and the student’s height.

18. HOMEWORK: STATSTICS #5 MEAN ABSOLUTE DEVIATION