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Lecture Communication research - Chapter 10: Descriptive statistics

The learning objectives for this chapter include: Explain the concept of the normal curve; look for evidence of normally distributed data when you read research reports; read a frequency distribution and polygon; describe the differences among mean, median, and mode; explain how the standard deviation affects interpretation of the mean; accurately interpret tables that report data as frequencies and percentages. Chapter 10 Descriptive Statistics Numbers One tool for collecting data about communi

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Chapter 10 Descriptive Statistics Numbers One tool for collecting data about communication phenomena Capture quality, intensity, value, or degree Only meaningful if they are interpreted Operationalizations specify how data are collected and become numerical Copyright c 2001 The McGraw­Hill Companies, Inc. 1 Looking at a Data Set Copyright c 2001 The McGraw­Hill Companies, Inc. 2 Normal Curve Also known as bell curve A theoretical distribution of scores Majority of cases distributed around the peak in the middle Progressively fewer cases moving away form the middle Symmetrical – one side mirrors the other Mean, median, and mode have the same value Copyright c 2001 The McGraw­Hill Companies, Inc. 3 Normal Curve Copyright c 2001 The McGraw­Hill Companies, Inc. 4 Skewed Distributions Curve is asymmetrical Positively skewed curve – very few high scores Negatively skewed curve – very few low scores Copyright c 2001 The McGraw­Hill Companies, Inc. 5 ... - tailieumienphi.vn
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