Mean variance standard deviation - PowerPoint PPT Presentation

Statistics

Statistics. Chapter 4: Discrete Random Variables. Where We’ve Been. Using probability to make inferences about populations Measuring the reliability of the inferences. Where We’re Going. Develop the notion of a random variable Numerical data and discrete random variables

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Statistics

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Sampling

Sampling . The Statistical Adventure Begins. Populations. Def: Census Sample Which is better? census? sample?. Step 1: Define the Target Population. Must be very specific: What is a user? What demographics matter? Are there geographic boundaries? What is the relevant time period?

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