# Lecture 1 - What are the 3 most important decisions in your...

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What are the 3 most important decisions in your life?

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What are the 3 most important decisions in your life? What you want to do with your life? Who do you want to spend it with? (e.g. marriage) How many kids do you have?
Kids: How Many? 1 ? 2 or more? Why not test the whole country to see whose happier? Mission: Impossible (too many people to test)

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Parents: who’s happier? Parents of 1 (K1) Parents of 2 or more (K1+) Why not test the whole country to see whose happier? Mission: Impossible (too many people to test)
Statistics – the way to truth How can we make a good guess about the whole population without measuring everybody? Answer: measure some of the people and try to generalize that measurement to whole population

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Statistics – the way to (mostly) truth Guesses (inferences) we make from samples are not perfect but have ERROR Why? Because we are not measuring everybody so we might be wrong in our guess (inference)
Statistics – the way to (mostly) truth Sample is greatly affected by which subjects we choose , but population we choose from is same. Choose 2 people at random – notice how much sample changes as a result of choice

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Statistics – the way to (mostly) truth Error comes from Variability Which subjects we choose is called Between Subjects Variability
Statistics – the way to (mostly) truth Other sources of variability? Psychological processes and behavior is performed in a brain which fluctuates “Remembering the Stone”

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Statistics – the way to (mostly) truth Within subjects variability Depends on what is measured and how often Memory – considerable at times Height – not much Weight - considerable
Statistics – the way to (mostly) truth Summary of variability Within subjects variability Depends on task and time Between subjects variability Depends on which subjects chosen Also depends on how large sample size is

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## Lecture 1 - What are the 3 most important decisions in your...

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