Statistics Chapter 1 Flashcards

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Questions and Answers

What are the characteristics of individuals about which we collect information called?

  • Data
  • Features
  • Variables (correct)
  • Attributes

What do we call variables that classify individuals into categories?

qualitative

  • variables are always numerical.

quantitative

Qualitative variables can be divided into types * and *.

<p>nominal and ordinal</p>
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A * variable is a quantitative variable whose possible values can be listed.

<p>discrete</p>
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  • variables can take on any value in some interval.

<p>continuous</p>
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Ounces in a soda pop. Quantitative or Qualitative?

<p>quantitative</p>
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The candy bars the kids are selling are milk chocolate, milk chocolate with almonds, dark chocolate, and caramel. Is this nominal or ordinal?

<p>nominal</p>
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The number of books on a shelf. Discrete or continuous?

<p>discrete</p>
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Study Notes

Variables

  • Characteristics of individuals from whom data are collected.
  • Different types of variables influence the analysis of data.

Qualitative Variables

  • Classify individuals into categories based on characteristics.
  • Can be divided into two types:
    • Nominal: Categories without a specific order (e.g., types of candy bars).
    • Ordinal: Categories with a defined order, but not necessarily equidistant (not mentioned in detail).

Quantitative Variables

  • Always numerical, allowing for mathematical operations.
  • Can be subdivided into:
    • Discrete: Quantitative variables that can take on specific values (e.g., number of books on a shelf).
    • Continuous: Quantitative variables that can take any value within a given range (not explicitly defined in the text).

Examples

  • Ounces in a soda pop serve as an example of a quantitative variable.
  • Types of candy bars sold by kids illustrate nominal qualitative variables.

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