1. 13.3 Stem- and-Leaf Plots SWBAT read and make single and back-to- back stem-and-leaf plots SWBAT compare sets of data given in stem- and-leaf plots SWBAT find measures of central tendency from data displayed on stem-and-leaf plots

2. Vocabulary  Stem-and-Leaf Plot- a type of graph that arranges numerical data in order of place value  Measures of central tendency- used to describe sets of data; represent a centralized or middle value  Mean- the average number  Median- the middle number or mean of the two middle numbers  Mode- the number(s) that occur most often

3. How to make a stem-and- leaf plot  Label two table columns Stem and Leaf  Use all the digits to the left of the last digit of each data value as the stems. List these digits in increasing order down the stem column  Use the far right digit(s) of each datum for the leaves. Write each leaf to the right of its stem in increasing order  Write a key to show the meaning of each datum in the plot  Write a title for the graph

4. Make a stem-and-leaf plot for the given data. Then find the measures of central tendency for the data Weights of Twenty Teenagers (in kg) 53 72 51 38 43 49 64 48 40 58 47 48 56 68 Weights of Twenty Teenagers (in Kg) StemLeaf 38 40 3 7 8 8 9 513 6 8 64848 72 Mean: 52.5 Median: 50 Mode: 48

5. Mass in Kilograms 53 72 51 38 43 49 64 49 60 62 48 40 58 47 48 56 68 45 51 60 Make a stem-and-leaf plot for the given data. Then find the measures of central tendency for the data Mass in Kilograms StemLeaf 38 40 3 5 7 8 8 9 9 511 3 6 8 60 0 2 4 8 72 Mean: 53.1 kg Median: 51 Modes: 48, 49, 51, 60

6. Back-to-back-stem-and- leaf plots MonthMinimumMaximum Jan1734 Feb1936 March2845 April3756 May4767 June5575 July6180 August5978 September5271 October4161 November3349 December2339

7. Back-to-Back Stem-and- Leaf Plot Minimum and Maximum Monthly Temperature 2000-2009 Minimum TempStemMaximum Temp 97971 83832 737334 6 9 717145959 9 5 256 161717 71 5 8 80