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Chp_2-1

# Chp_2-1 - CHAPTER 2 Frequency Distributions lick to edit...

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Click to edit Master subtitle style 8/3/10 CHAPTER 2 Frequency Distributions and Graphs

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Click to edit Master subtitle style 8/3/10 Introduction This chapter will show how to organise data by constructing frequency distributions and then construct appropriate graphs to represent the data in a concise, easy to understand form.
Click to edit Master subtitle style 8/3/10 Basic Vocabulary * When data are collected in original form, they are called raw data . * A frequency distribution is the organization of raw data in table form, using classes and frequencies. * The two most common distributions are categorical frequency distribution and the grouped frequency distribution.

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Click to edit Master subtitle style 8/3/10 An Example Statistics exam grades. Suppose that 24 statistics students’ scores on an exam are as follows: 97, 92, 88, 75, 83, 67, 89, 55, 72, 78, 81, 91, 57, 63, 67, 74, 87, 84, 98, 46, 95, 58, 51, 85. It is very hard for us to tell the information from such a table full of raw data. Therefore, the researcher organizes the data by constructing a frequency distribution. The frequency
Click to edit Master subtitle style 8/3/10 Categorical Frequency Distributions The categorical frequency distribution is used for data that can be placed in specific categories, such as nominal- or ordinal- data.

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Chp_2-1 - CHAPTER 2 Frequency Distributions lick to edit...

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