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STA_Notes_8.22.07

# STA_Notes_8.22.07 - STA Class Two Methods of Sets of Data...

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STA Class 11:56:42 Ch. 2 – Methods for Describing Sets of Data Two Methods of Sets of Data: 1. Graphical o Oualitative00bar chart, pie chart o Quantitative00Stem and leaf, histogram 2. Numerical o Measures of central tendency, measures of variation. 2.1 Describing Qualitative Data Class--one of the categories into which data can be classified Class Frequency—number of observations in a particular class Class relative frequency—class frequency divided by the total number of observations in the data set. Example: What type of computer do you own? o NNOOBBNNO BONNONNOO BBNNOOBBN NOOBBONNB Table: o Class Frequency Relative Frequency o N(none) 16 44.4% o O ( 12 33.3% o B(laptop) 8 22.3% Can represent this data in a bar graph, pie chart, or histograph 2.2 Graphical Methods for Describing Quantitative Data Stem-and-Leaf Displays—represents each observation by its leading digit (the stem) and by its final digit (the leaf) o EX: Number of music CD’S you own

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STA Class 11:56:42 Ch. 2 – Methods for Describing Sets of Data
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