Lct01 - Introduction to Business Statistics Lecture 1...

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1 Introduction to Business Statistics Lecture 1 Descriptive Statistics I : Graphical Methods 1. Variable : A variable is a characteristic that changes over time, or a characteristic that varies across different individuals or objects under consideration at a particular point in time. 2. Types of variables : Categorical (qualitative) & Numerical (quantitative) Numerical variables can be further divided into two subtypes, discrete and continuous. 3. Frequency Distribution : a. Determine the number of classes b. Determine the class width c. Determine the class boundary d. Determine the frequency within each class
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2 Example 1: ( Price and Earning Ratio ) The data in Table 1 represents the P/E ratios for 25 different common stocks of growth companies listed on the over-the-counter markets. Construct a relative frequency distribution for them. P/E Ratios for 25 Common Stocks 20.5 19.5 15.6 24.1 9.9 15.4 12.7 5.4 17.0 28.6 16.9 7.8 23.3 11.8 18.4 13.4 14.3 19.2 9.2 16.8 8.8 22.1 20.8 12.6 15.9 Table 1
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Lct01 - Introduction to Business Statistics Lecture 1...

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