DATA ANALYSIS, PART 2 GHSGT Review

Pictographs A pictograph uses a small picture to represent a certain number of participants Pick the number of how many to represent based on how well it will divide into the totals Example: At a private school, there are 120 freshmen, 90 sophomores, 80 juniors, and 50 seniors. You would set each picture equal to 10 students because that divides nicely into all of the values. Freshmen Sophomores Juniors Seniors = 10 students

Bar Graphs A bar graph can be shown with either vertical bars, or horizontal bars The bar graph is the best way to compare totals of two items or categories Example: You can see that the Mazda plant manufactured approximately 1,100 more cars than the Honda plant.

Line Graphs A line graph is the best way to compare two variables It is also a great way to show change over time (also called trends), or whether a value is increasing or decreasing Example: Between mileages 30,000 and 60,000 showed the steepest decline in the value of Toni's car.

Circle Graphs Also known as pie charts, circle graphs are a good way to show parts of a whole, or percentages too Example: You can see in the graph that the Miller family spends most of its monthly income on rent. 10%35% TransportationRent 30% Groceries 15% Miscellaneous 10% Utilities

Venn Diagrams A Venn diagram shows how different groups are inter- related Make sure you correctly interpret how to find the totals from each of the parts Example: The number of people who had just pizza for lunch was 30, then 15 people had just a hamburger, but 10 people had both pizza and a hamburger. So, 25 hamburgers were eaten because = 25. PizzaHamburger

Sample Question 1 Which kind of graph is best used to show how three sets of a data are alike and different? A. circle graph B. bar graph C. Venn diagram D. line graph

Sample Question 2 The results of a survey asking how many people lived in a town over five years are shown in the chart. Which type of graph should be used to show the results of the survey? A. bar graph B. circle graph C. pictograph D. line graph YearPopulation 120, , , , ,000

Sample Question 3 Which kind of graph is best used to show a percent of share of a total? A. circle graph B. line graph C. pictograph D. bar graph

Sample Question 4 The distribution of extra-credit points in Ms. Washington's English class is shown on this graph. How many more students received five extra-credit points than seven extra- credit points? A. 2 B. 3 C. 4 D. 5

Sample Question 5 Use the same distribution of extra-credit points. What is the ratio of students receiving three points to students receiving five points? A. 1:3 B. 2:1 C. 1:2 D. 3:1

Solutions SQ1 – C SQ2 – A SQ3 – A SQ4 – A SQ5 - B