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Section 1.1 Part 1

Section 1.1 Part 1. AP Statistics CASA. We study statistics because…. … anecdotal evidence is not reliable. … we don’t wish to be lied to. … spotting trends helps us make good decisions Simply, we study statistics because we want to make sense of the world. Vocabulary.

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Section 1.1 Part 1

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  1. Section 1.1Part 1 AP Statistics CASA CASA, AP Stats 05-06, Section 1.1.1

  2. We study statistics because… • … anecdotal evidence is not reliable. • … we don’t wish to be lied to. • … spotting trends helps us make good decisions • Simply, we study statistics because we want to make sense of the world. CASA, AP Stats 05-06, Section 1.1.1

  3. Vocabulary • Individuals – objects in a data set. Sometimes referred to as x1, x2, x3, etc. • Variable – any characteristic of an individual • Thinking of the individuals in this room, what might some of their characteristics? CASA, AP Stats 05-06, Section 1.1.1

  4. Categorical vs. Quantitative • Categorical variables places individuals in one of several groups. • Quantitative variable takes numerical values for which arithmetic operations like adding make sense. • Of the variables describing the members of the class, which are categorical and which are quantitative? CASA, AP Stats 05-06, Section 1.1.1

  5. Distribution • “The distribution of a variable tells us what values the variable takes and how often it takes these values.” • How distributions differ between categorical and quantitative variables? CASA, AP Stats 05-06, Section 1.1.1

  6. Bar and Pie Charts • Both show relative frequencies of categorical values in a data set. CASA, AP Stats 05-06, Section 1.1.1

  7. Problems with Pie Charts CASA, AP Stats 05-06, Section 1.1.1

  8. Attributes of a “good” chart • Title • Axis Labels • Consistent Scale CASA, AP Stats 05-06, Section 1.1.1

  9. Assignment • Exercises 1.1 – 1.6, Practice of Statistics CASA, AP Stats 05-06, Section 1.1.1

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