Chapter_2_-Frequency_Distribution-.pptx - BASIC STATISTICS Chapter 2 Frquency Distributions Mr Sa\u00e2d BELKOUCH OUTLINE \u2022 Organizing Data \u2022 Histograms

# Chapter_2_-Frequency_Distribution-.pptx - BASIC STATISTICS...

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BASIC STATISTICS Chapter 2 Frquency Distributions Mr. Saâd BELKOUCH
OUTLINE Organizing Data Histograms and Other Types of Graphs 2
Frequency Distribution A frequency distribution is the organization of raw data in table form, using classes and frequencies. Example: Suppose a researcher wished to do a study on the ages of the top 50 wealthiest people in the world. The researcher first would have to get the data on the ages of the people. When the data are in original form, they are called raw data and are listed next. 3 49 57 38 73 81 74 59 76 65 69 54 56 69 68 78 65 85 49 69 61 48 81 68 37 43 78 82 43 64 67 52 56 81 77 79 85 40 85 59 80 60 71 57 61 69 61 83 90 87 74
Frequency Distribution (cont.) Since little information can be obtained from looking at raw data, it can be organized into a frequency distribution which consists of classes and their corresponding frequencies . Each raw data value is placed into a quantitative or qualitative category called a class. The frequency of a class then is the number of data values contained in a specific class. 4 Class limits Frequency 35-41 3 42-48 3 49-55 4 56-62 10 63-69 10 70-76 5 77-83 10 84-90 5
Frequency Distribution (cont.) The classes in this distribution are 35-41, 42-48, etc. These values are called