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chapter2 - Chapter 2 Frequency Distributions PowerPoint...

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Chapter 2 Frequency Distributions PowerPoint Lecture Slides Essentials of Statistics for the Behavioral Sciences Seventh Edition by Frederick J Gravetter and Larry B. Wallnau
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Chapter 2 Learning Outcomes
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Concepts to review Proportions (math review, Appendix A) Fractions Decimals Percentages Scales of measurement (Chapter 1) Nominal, ordinal, interval, and ratio Continuous and discrete variables (Chapter 1) Real limits (Chapter 1)
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2.1 Introduction to Frequency Distributions A frequency distribution is An organized tabulation Showing the number of individuals located in each category on the scale of measurement Can be either a table or a graph Always shows The categories that make up the scale The frequency, or number of individuals, in each category
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2.2 Frequency Distribution Tables Structure of Frequency Distribution Table Categories in a column (usually highest to lowest) Frequency count next to category To compute ΣX from a table Convert table back to original score or Compute Σ f X
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Proportions and Percentages Proportions Measures the fraction of the total group that is associated with each score Called relative frequencies because they describe the frequency ( f ) in relation to the total number (N) Percentages N f p proportion = = Expresses relative frequency out of 100 Can be included as a separate column in a frequency distribution table ) 100 ( ) 100 ( N f p percentage = =
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Ex. 2.3 Frequency, Proportion and Percent in a Table This is an adaptation of example 2.3
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Learning Check Use the Frequency Distribution Table to determine how many subjects were in the study
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Learning Check - Answer Use the Frequency Distribution Table to determine how many subjects were in the study
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Learning Check Is each of these statements True or False for the Frequency Distribution shown?
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Learning Check - Answer
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chapter2 - Chapter 2 Frequency Distributions PowerPoint...

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