2 Objectives Create dot plots. Use a dot plot to describe the shape of a data distribution.
3 Vocabulary dot plot uniform distribution symmetric distribution skewed distribution
4 A dot plot is a data representation that uses a number line and x’s, dots, or other symbols to show frequency. Dot plots are sometimes called line plots.A dot plot gives a visual representation of the distribution, or “shape”, of the data. The dot plots in Example 1 have different shapes because the data sets are distributed differently.
6 Example 1 and 2 :Making a Dot Plots and Shapes of Distribution Gloria is collecting different recipes for chocolate chip cookies. The table shows the cups of flours needed in the recipes. Make a dot plot showing the data. Determine the distribution of the data and explain what the distribution means.
7 Example 1 and 2 : Continued Find the least and greatest number in the cups of flour data set. Then use the values to draw a number line. For each recipe, place a dot above the number line for the number of cups of flour used in the recipe.123Amount of Flour RecipesCup
8 Example 1 and 2 : Continued The distribution is skewed to the right, which means most recipes require an amount of flour greater than the mean.
9 Check It Out! Example 1The cafeteria offers items at six different prices. John counted how many items were sold at each price for one week. Make a dot plot of the data.Find the least and greatest number in the price data set. Then use the values to draw a number line. For each item, place a dot above the number line for the cost of that item.
10 Check It Out! Example 1 Continued 1.5184.108.40.2064
11 Check It Out! Example 2Data for team C members are shown below. Make a dot plot and determine the type of distribution. Explain what the distribution means.
12 Check It Out! Example 2 Continued 3456The data distribution is uniform. All team members ran about the same distance.