Ch 1-2 Review

1) Following are SAT math scores for an AP Statistics class of 20 students: 664, 658, 610, 670, 640, 643, 675, 650, 676, 575, 660, 661, 520, 667, 668, 635, 671, 673, 645, and 650. The distribution of scores is A) symmetric B) skewed to the left C) skewed to the right. D) uniform E) bell-shaped

2) Which of the following statements is always true 2) Which of the following statements is always true? A) Stemplots are useful both for quantitative and categorical data sets. B) Stemplots are equally useful for small and very large data sets. C) Stemplots can show symmetry, gaps, clusters, and outliers. D) Stemplots do not display the actual observations. E) Stemplots cannot be used with continuous, numerical data.

3) A histogram of the education level (in number of years of schooling) of the adult population of the United States would have which of the following characteristics? I. Symmetry II. Clusters III. Skewness to the left A) II only B) I and II C) I and III D) II and III E) I, II and III

4) Consider the following histogram: Number of persons indicted for public corruption (federal courts) Which of the following statements are true? Each year from 1977 to 1986 the number of indictments has steadily decreased. While the number of indictments has decreased each year, the amount of decrease has lessened. The labeling of the horizontal axis has resulted in a misleading picture. A) I only B) II only C) III only D) I and II E) None of the above gives the complete set of true responses. Number of persons indicted for public corruption (federal courts)

5) Which of the following distributions are more likely to be skewed to the left than skewed to the right? A) Household incomes B) Price of homes C) Ages (in years) of teenage drivers D) Age (in years) of coins in circulation E) Price of all 2006 cars

6) Which of the following are true statements. I 6) Which of the following are true statements? I. Two students working with the same set of data may come up with histograms that look different. II. Displaying outliers is less problematic when using histograms than when using stemplots. III. Histograms are more widely used than stemplots or dotplots because histograms display the values of individual observations. A) I only B) II only C) III only D) I and II E) II and III

7) Which of the following statements is true 7) Which of the following statements is true? A) Dotplots can only be used with discrete numerical data. B) The original data can be obtained from a histogram. C) Stem-and-leaf plots can be used with discrete or continuous data. D) Bar graphs can be used with continuous data. E) Cumulative relative frequency plots are not useful to find percentiles.

8) Consider the variable yearly income for residents of a large city 8) Consider the variable yearly income for residents of a large city. Which of the following is a true statement? A) The distribution for yearly income could be graphed using a bar graph and would be skewed right. B) The distribution for yearly income could be graphed using a histogram and would be approximately symmetrical. C) The distribution for yearly income could be graphed using a pie chart would be skewed left. D) The distribution for yearly income could be graphed using a histogram would be skewed right. E) The distribution for yearly income could be graphed using a stem-and-leaf plot and would be skewed left.

9) Following is a histogram of test scores 9) Following is a histogram of test scores. Which of the following statements are true? The middle score is 75. If the passing score was 60, most students failed. More students scored between 50 & 80 then between 90 & 100. A) I only B) II only C) III only D) II and III E) I, II, and III

10) The following frequency chart shows the seniority (in years) of people working in a machine shop. Which of the following graphs could be constructed with this data? Seniority I. cumulative relative frequency plot II. stem-and-leaf plot III. histogram A) II only B) III only C) I and III only D) II and III only E) I, II, and III Seniority Frequency 0-4 5 5-9 7 10-14 10 15-19 8