Outliers An outlier is an observation that lies an abnormal distance from other values in a data set. Sometimes an outlier is the result of a mistake and sometimes it is not. Roll #1: What is the outlier in the following data set? 44, 43, 51, 47, 48, 54, 54, 49, 102, 55, 53, 42, 41, 43? Dotplots A dotplot consists of a graph in which each data value is plotted as a point (or dot) along a scale of values. Example 4: Create a dot plot with the following data entries of the weight (in lbs) of adult cats that were brought into Santa Clara Animal Shelter. 13, 8, 7, 5, 7, 12, 11, 10, 8, 8 Step 1: Draw a horizontal line and mark off even-spaced increments. Do not skip any numbers! Step 2: Plot each data value with a dot or point above the corresponding value on the horizontal axis. For repeated data values, stack the dots. Scatterplots A scatterplot is a plot of paired (x,y) quantitative data with a horizontal x-axis and a vertical y-axis. We will use scatterplots in Chapter 9. Example 5: Create a scatterplot for the following data X 3 4 6 7 8 13 V 3 5 4 5 9 10 8 Step 1: Write numbers as ordered pairs (x, y) Step 2: Create a graph with evenly spaced boxes and label axes with even spaced increments (by Is. 5s, 10s, etc.) Step 3: Plot each data point on the grid below