Stat-1031 (Introduction to Statistics) Test 1 Review

I. Picturing Distributions with Graphs (Reference Chapter 1) Important objectives include being able to • define: individuals, categorical and quantitative variables • identify: outliers, symmetric and skewed distributions. • interpret graphs: pie chart, bar graph, histogram, dotplot, for example 1. Stream quality is based on the levels of many variables, including the following. Which of these variables is quantitative? A. The amount of phosphorus B. The number of distinct species present C. The amount of dissolved oxygen D. All of the above 2. Here is a histogram of the memory scores of adults age 60 to 95. What is the best description of the overall shape of the distribution? A. Bimodal B. Skewed to the right C. Skewed to the left D. Roughly symmetric with a few outliers 3. Here is a dotplot that shows the number of passengers in a department store elevator at a random selection of times during the day. Which of the below is the best description of the distribution of the number of passengers in the elevator? A. symmetric with 3 outliers. B. left-skewed. C. right-skewed. D. multimodal. ....................................CONTINUED........................................