Warm-Up 1.If you could pick a bedroom size, which would you rather have and why? a. L= 20 W=10 b. L=30 W= 5 2.Explain your answer.

Homework Due Today YearVisitorsYearVisitors U.S. Skier/Snowboarder Visits 1. Make a line graph using every 5 th year, starting with What trend does the graph show? 2. Make a new line graph using all the years given in the table. What trend does it show? 3. Which line graph represents the data more accurately, the one in part (a) or the one in part (b)? Explain.

Homework Due Tomorrow The stem-and-leaf plot shows the times (in minutes) for 30 men who completed the 2002 Boston Marathon using a wheelchair. a)What was the fastest time? b)Find the median of the times. c)What percent of the participants finished the race in less than 2 hours? d)The fastest female wheelchair time in the marathon was 1 hour 4y minutes. How does this time compare with the times of the 309 males participants? Wheelchair Marathon Times Key: 8 3 minutes

Line Graphs and Frequency Tables Wednesday February 16, 2010

Today I can… ….determine whether to display specific data in line graphs and frequency tables and use stem- and-leaf plots to statistically analyze data.

21st Century Skills A marathon is about 1,660,000 inches long. Suppose a wheelchair has a rear wheel with a diameter of 18 inches. If the wheelchair travels the entire marathon route, about how many revolutions does the wheel make?

Organizing vs Displaying Data Stem and leaf plot (numerical) Frequency table (categorical) Bar graph (Categorical) Histogram (numerical) Line graph (numerical)

Line Graphs We use line graphs to represent data that changes continuously over time. Vertical Axis is what is changing Horizontal axis is usually “time.” Line graphs show positive and negative trends on a continuous basis. Comparisons of data over time. Compare two things at once.

Stem and Leaf Plots This is similar to a frequency table: it is used to organize data, not display it. 1.First make a t-chart with the stem on the left and leaves on the right: 2.Stem: all but the last digit of a number 3.Leaf: last digit of the data point. This chart could help us organize a large amount of information. I can see at a glance which number(s) would be in the middle of the data set or which ones occur most, and I can easily obtain the sum of the data points in order to calculate the mean, or average. StemLeaf

Today’s Activities 1.Scavenger Hunt using the “analyzing all graphs” activity: – Different graphs will be placed on the wall around the room for students to answer questions pertaining to each one. 2.Achieve 3000: W.E.B. Dubois: Life of a Leader real world math activity, level 8

Essential Question When do you use line graphs to display data?