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Reporting Frequency

Reporting Frequency. LESSON 11-1. Problem of the Day. Mari can package 14 seashells in a box. If she has 360 seashells, how many full boxes does she have? How many shells are left over after the boxes are filled?. 25; 10. 11-1. Reporting Frequency. LESSON 11-1. What we’ll study today.

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Reporting Frequency

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  1. Reporting Frequency LESSON 11-1 Problem of the Day Mari can package 14 seashells in a box. If she has 360 seashells, how many full boxes does she have? How many shells are left over after the boxes are filled? 25; 10 11-1

  2. Reporting Frequency LESSON 11-1 What we’ll study today • Frequency table • Line plot • Histogram • These are all ways to show often something occurs. 11-1

  3. Reporting Frequency LESSON 11-1 • A frequency table lists each item in a data set. 11-1

  4. Age 5 6 7 8 9 10 11 12 13 Tally Frequency Reporting Frequency LESSON 11-1 Additional Examples – Frequency table The numbers below represent the ages of the students in a karate class. Make a frequency table of the data. 11   5   9   13   8   9   9   11   10   8   6   7   12   11  13   12   7   6   11   12   10   8 1 2 2 3 3 2 4 3 2 Which method of describing data is easily seen in a frequency table? 11-1

  5. Reporting Frequency LESSON 11-1 • A line plot shows the shape of the data • Data is on a number line (stacks of Xs show frequency) • Best for a small number of data values • Xs must be spaced evenly 11-1

  6. Write an x for each student above the age of that student. Draw a number line from the least to the greatest data item. Reporting Frequency LESSON 11-1 Additional Examples – Line plot Make a line plot of the data in Example 1. 11   5   9   13   8   9   9   11   10   8   6   7   12   11  13   12   7   6   11   12   10   8 • Best for a small number of data values (Why?) • Xs must be spaced evenly (Why?) 11-1

  7. Reporting Frequency LESSON 11-1 • A histogram also shows the shape of data. • bar graph (no spaces between the bars) • equally sized intervals with no overlap 11-1

  8. Hours Tally Hours Tally 1 11 2 12 3 13 4 14 5 15 6 16 7 17 8 18 9 19 10 20 Add a title. Label each axis. Label each axis. Reporting Frequency LESSON 11-1 Additional Examples - Histogram Make a histogram of the data below. Hours Spent on the Internet 11-1

  9. Reporting Frequency LESSON 11-1 (For help, go to Lesson 1-6.) • For histograms: • Title • Decide the intervals (evenly spaced, no overlap) • Labeled axes • X-axis – intervals • Y-axis – frequency (always) • Make bars of equal width • Use a ruler! 11-1

  10. Students 23 24 25 3 4 2 Class Reporting Frequency LESSON 11-1 Lesson Quiz 1. Make a frequency table and a line plot for the number of students in each class: 25 24 25 23 24 23 24 24 23. 11-1

  11. What is this called? Hours 0–5 6–10 11–15 16–20 21–25 Frequency 3 5 10 24 15 Reporting Frequency LESSON 11-1 Lesson Quiz 2. The data table below shows how many hours of TV different people watch each week. Make a histogram of the data. How else can you display this data? 11-1

  12. Reporting Frequency LESSON 11-1 Closure What is a frequency table? What do histograms and line plots have in common? What do frequency tables, histograms, and line plots have in common? 11-1

  13. Reporting Frequency LESSON 11-1 Homework • Homework for Monday: • Lesson 11-1 p. 534 - 536: # 5, 7, 9, 12-16 all • Test on Chapter 3 11-1

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