2Objectives Create dot plots. Use a dot plot to describe the shape of a data distribution.
3Vocabulary dot plot uniform distribution symmetric distribution skewed distribution
4A 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.
6Example 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.
7Example 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
8Example 1 and 2 : Continued The distribution is skewed to the right, which means most recipes require an amount of flour greater than the mean.
9Check 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.
10Check It Out! Example 1 Continued 1.5126.96.36.1994
11Check 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.
12Check It Out! Example 2 Continued 3456The data distribution is uniform. All team members ran about the same distance.