ProbSampPop_Sp08_BB_NoColor

# ProbSampPop_Sp08_BB_NoColor - Basic Principle Probability...

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1 Probability, Samples & Populations Basic Principle • Examine the probability that the outcome of a study might be possible even if the true situation was that the experimental manipulation made no different (i.e., had no effect). Probability • Cannot determine definitive truth or falsity of theories. – Never use the “p” word… • Therefore, we need to use probability to determine the likelihood of an event occurring. Probability • The likelihood of an event occurring – Examples – coin flip, pick a number…

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2 Probability • Range: – Proportion: 0 to 1.00 – Percentages: 0% - 100% • Probabilities as symbols: p p < 0.05 Probabilities and Sampling Distributions • All statistical tests rely on sampling distributions to determine the probability that results are consistent with the null hypothesis Examples of different sampling distributions Hypothesis Testing • How do we know if we have a true effect or just something due to chance? • Does the outcome of our study support our theory?
3 What is a “true” difference? Null is true

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ProbSampPop_Sp08_BB_NoColor - Basic Principle Probability...

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