Mari can package 14 seashells in a box. If she has 360 seashells, how 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

These are all ways to show often something occurs. 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

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

Which method of describing data is easily seen in a frequency table? 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 Age 5 6 7 8 9 10 11 12 13 Tally Frequency 1 2 2 3 3 2 4 3 2 Which method of describing data is easily seen in a frequency table? 11-1

A line plot shows the shape of the data 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

Make a line plot of the data in Example 1. 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 Write an x for each student above the age of that student. Draw a number line from the least to the greatest data item. Best for a small number of data values (Why?) Xs must be spaced evenly (Why?) 11-1

A histogram also shows the shape of data. 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

Hours Spent on the Internet Reporting Frequency LESSON 11-1 Additional Examples - Histogram Make a histogram of the data below. Hours Spent on the Internet 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. 11-1

Decide the intervals (evenly spaced, no overlap) Labeled axes 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

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. Students Class 23 24 25 2 4 3 11-1

How else can you display this data? 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. Hours Frequency 0–5 6–10 11–15 16–20 21–25 3 5 10 24 15 What is this called? How else can you display this data? 11-1

What is a frequency table? 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

Homework for Monday: Lesson 11-1 p. 534 - 536: # 5, 7, 9, 12-16 all 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