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

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

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

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) Weights of Twenty Teenagers (in Kg) StemLeaf Mean: 52.5 Median: 50 Mode: 48

Mass in Kilograms Make a stem-and-leaf plot for the given data. Then find the measures of central tendency for the data Mass in Kilograms StemLeaf Mean: 53.1 kg Median: 51 Modes: 48, 49, 51, 60

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

Back-to-Back Stem-and- Leaf Plot Minimum and Maximum Monthly Temperature Minimum TempStemMaximum Temp