2. Line Graphs

3. Bar Graph vs Line Graph What is the difference between a bar graph and a line graph?

4. Line Graph A line graph is a graph used to show change over time !! What can time be measured in??? Seconds - Minutes - Hours – Days - Weeks - Months – Years - Decades - Centuries - etc.

5. When to use a line graph? Would we use a line graph in the following situations: To show how many people like pizza in this class? NO To show how many people live in East Meadow? NO To show how much it rained each month this year? YES- because months and years deal with time.

6. Birthdays? Our birthday does deal with time doesn’t it? (months/years) But, our birthday is constant, meaning it never changes. A line graph shows change in time, so we would not use it for this type of graph. Would we use a line graph to show when our birthdays are?

7. How do we make a line graph? A line graph ALWAYS has a title! A line graph has two different axis’s An axis is either the horizontal line (called x) or the vertical line (called y) that form the base lines of a graph. Y X

8. X-axis and Y-axis When you are making a line graph, the x-axis is always horizontal, and the y- axis is always vertical. The x and y-axis usually starts with zero on a line graph It is important to make sure that the intervals on our y-axis are always equal. What do I mean by this?

9. 10/17/20158 Plotting a Line graph When we are plotting a line graph, it is important to read what information is on each axis. There must be a label on each axis that describes the information. Much like a bar graph, we look at the x-axis first in order to plot our points. Time in minutes

10. 10/17/20159 Is this an acceptable graph? Time Car Trip

11. 10/17/201510 What information do you need to interpret a graph? The graph we just looked at does not have any numbers on the x-axis or the y- axis. Can we still draw conclusions and answer questions about that graph? How many times did the driver stop driving during the trip? Time Car Trip

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13. 10/17/201512 Q & A How many days did this person travel less than 30 miles? Which day did the driver travel the least amount of miles? Why might someone want to keep track of their miles for the week? 5 days Sunday To figure out how much gas they need a week.

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15. Q & A About how much corn did the U.S. have in 1991? What does the y-axis represent in the graph? Can you think of another title for this graph? About 77 million acres The rise and fall of corn in the U.S. Acres of corn in millions.

16. Double Line Graphs Are line graphs that display two sets of data at the same time. Usually they are related in some way. 10/17/201515

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18. Example1 YearHourly Rate 19701.60 19803.10 19903.80 20005.15 10/17/201517 U.S. Minimum Wage

19. Example2 10/17/201518 Number of pounds for Sara’s two pets JanFebMarAprMayJun Ginger3915212425 Toto4813172426

20. Assignment Page 316 problems 1-10

21. 10/17/201520 Make your own….. Now that you have had time to interpret graphs, I would like you to make your own graphs. Remember to read the information carefully and label everything!

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25. 10/17/201524 Do these have the same information on them?

26. 10/17/201525 Great Job!