Standard DA-2, DA-3 Objectives: 1. Introduce the basic terminology in chapter 3 2. Do problems to find measures of central tendency.

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Presentation transcript:

Standard DA-2, DA-3 Objectives: 1. Introduce the basic terminology in chapter 3 2. Do problems to find measures of central tendency

Key terms Center Shape Spread Mean Median Mode Midrange Average Grouped mean Weighted mean

Measures of Center It is a value at the center or middle of a data set The measures are mean, median, mode, and midrange

Mean is not a resistant measure Median is a resistant measure Mode: No, Bi, Multi Midrange is easy to compute

Average Note that average is not a statistical term. Never use the term average in statistics

Mean, only interval level and ratio level Median, all four levels except nominal Mode, all four levels

Measures of center Ungrouped data Grouped data

Textbook Short Answer questions: Do the problems: 1 thru 28 yourself Long Answer Questions: Do the problems: Page 97: 29 thru 34 (Guided)