STT201A Week 1 Lecture 1

Areas of Statistics

1. Descriptive Statistics
   • Concerned with summarizing sets of data
2. Inferential Statistics
   • Methods that make possible the estimation of a characteristic of a population or the making of a decision concerning a population based on information provided by the sample.

Descriptive vs Inferential Stats

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Scales of Measurement

1. Nominal Measurement: Qualitative variable
2. Ordinal Measurement: Qualitative; values are simply “classes” or labels (with implied ordering)
3. Interval Measurement: Quantitative; arbitrary zero point
4. Ratio Measurement: Quantitative; fixed zero point

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On a particular weekday, males own 30 of the 40 cars in the parking lot. Twenty of the parked cars are colored red, and 25 were Japanese-made.

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